24 results on '"Silvia M. Barolo"'
Search Results
2. Transition-Metal-Free and Visible-Light-Mediated Desulfonylation and Dehalogenation Reactions: Hantzsch Ester Anion as Electron and Hydrogen Atom Donor
- Author
-
Micaela D Heredia, Walter D. Guerra, Silvia M. Barolo, Roberto A. Rossi, María E. Budén, and Santiago J Fornasier
- Subjects
010405 organic chemistry ,Dimethyl sulfoxide ,VISIBLE LIGHT ,Aryl ,Organic Chemistry ,Halide ,Halogenation ,Hydrogen atom ,Benzenesulfonates ,010402 general chemistry ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,purl.org/becyt/ford/1 [https] ,REDUCTION ,chemistry.chemical_compound ,chemistry ,Transition metal ,Reagent ,purl.org/becyt/ford/1.4 [https] ,HANTZSCH ESTER ,DESULFONYLATION - Abstract
Novel approaches for N- and O-desulfonylation under room temperature (rt) and transition-metal-free conditions have been developed. The first methodology involves the transformation of a variety of N-sulfonyl heterocycles and phenyl benzenesulfonates to the corresponding desulfonylated products in good to excellent yields using only KOtBu in dimethyl sulfoxide (DMSO) at rt. Alternately, a visible light method has been used for deprotection of N-methyl-N-arylsulfonamides with Hantzsch ester (HE) anion serving as the visible-light-absorbing reagent and electron and hydrogen atom donor to promote the desulfonylation reaction. The HE anion can be easily prepared in situ by reaction of the corresponding HE with KOtBu in DMSO at rt. Both protocols were further explored in terms of synthetic scope as well as mechanistic aspects to rationalize key features of desulfonylation processes. Furthermore, the HE anion induces reductive dehalogenation reaction of aryl halides under visible light irradiation. Fil: Heredia, Micaela Denise. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Guerra, Walter Damián. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Barolo, Silvia Maricel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Fornasier, Santiago J.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Rossi, Roberto Arturo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Budén, María E.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
- Published
- 2020
- Full Text
- View/download PDF
3. Design, synthesis, and in vitro evaluation of tubulin-targeting dibenzothiazines with antiproliferative activity as a novel heterocycle building block
- Author
-
José M. Padrón, Roberto A. Rossi, Daniel Lucena-Agell, Silvia M. Barolo, Walter D. Guerra, Rafael Hortigüela, J. Fernando Díaz, Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina), Universidad Nacional de Córdoba (Argentina), Agencia Nacional de Promoción Científica y Tecnológica (Argentina), Ministerio de Ciencia e Innovación (España), Consejo Superior de Investigaciones Científicas (España), Fundación Tatiana Pérez de Guzmán el Bueno, European Commission, Club Escola Hungaresa de Esgrima de Pontevedra, Lucena-Agell, Daniel [0000-0001-7198-2900], Hortigüela, Rafael [0000-0002-9621-6441], Díaz, José Fernando [0000-0003-2743-3319], Padrón, José M. [0000-0001-6268-6552], Barolo, Silvia M. [https://orcid.org/ 0000-0003-3730-0018], Lucena-Agell, Daniel, Hortigüela, Rafael, Díaz, José Fernando, Padrón, José M., and Barolo, Silvia M.
- Subjects
Biological test ,Cell Survival ,Stereochemistry ,Thiazines ,Antineoplastic Agents ,01 natural sciences ,Biochemistry ,Drug design ,Structure-Activity Relationship ,03 medical and health sciences ,chemistry.chemical_compound ,Heterocyclic Compounds ,Tubulin ,Thiazine ,Cell Line, Tumor ,Drug Discovery ,Animals ,Humans ,General Pharmacology, Toxicology and Pharmaceutics ,Solid tumor ,Cell Proliferation ,030304 developmental biology ,Dibenzothiazines ,Pharmacology ,0303 health sciences ,Sulfonamides ,Dose-Response Relationship, Drug ,Molecular Structure ,biology ,010405 organic chemistry ,Chemistry ,Organic Chemistry ,Brain ,Dibenzothiazine ,Tubulin inhibitors ,Antiproliferation ,Tubulin Modulators ,In vitro ,0104 chemical sciences ,3. Good health ,Design synthesis ,Cell culture ,biology.protein ,Molecular Medicine ,Cattle ,Drug Screening Assays, Antitumor - Abstract
14 p.-4 fig.-2 tab.- 8 schem., We prepared a series of free NH and N-substituted dibenzonthiazines with potential anti-tumor activity from N-aryl-benzenesulfonamides. A biological test of synthesized compounds (59 samples) was performed in vitro measuring their antiproliferative activity against a panel of six human solid tumor cell lines and its tubulin inhibitory activity. We identified 6-(phenylsulfonyl)-6H-dibenzo[c,e][1,2]thiazine 5,5-dioxide and 6-tosyl-6H-dibenzo[c,e][1,2]thiazine 5,5-dioxide as the best compounds with promising values of activity (overall range of 2-5.4 μM). Herein, we report the dibenzothiazine core as a novel building block with antiproliferative activity, targeting tubulin dynamics., This study was supported by Agencia Córdoba Ciencia,Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET),Secretaría de Ciencia y Tecnología,Universidad Nacional de Córdoba (SECyT),and Agencia Nacional de Promoción Científica y Técnica(ANPCyT).W. D. G. gratefully acknowledge receipt of fellowship from CONICET.J. M. P. thanks the Spanish Government for financial support through project PGC2018-094503-B-C22(MCIU/AEI/FEDER,UE). The biochemical work was supported by grants Ministerio de Ciencia e Innovación PID2019-104545RB-I00/AEI/10.13039/501100011033,PIEs 201920E111 and 202020E301 from Consejo Superior de Investigaciones Científicas,grant “Bases moleculares de la regulación de microtúbulos y sus implicaciones en la neurotoxicidad producida por fármacos ”from Fundación TATIANA and European Union H2020-MSCA-ITN-2019 860070TUBINTRAIN grant to JFDP and a generous donation from Club Deportivo Escuela Hungaresa de Pontevedra.
- Published
- 2021
4. Room-Temperature and Transition-Metal-Free Intramolecular α-Arylation of Ketones: A Mild Access to Tetracyclic Indoles and 7-Azaindoles
- Author
-
Maurice Médebielle, Walter D. Guerra, Benoît Joseph, Chérif Adouama, Roberto A. Rossi, Marcelo Puiatti, Silvia M. Barolo, María E. Budén, Synthèse de Molécules d'Intérêt Thérapeutique (SMITh), Institut de Chimie et Biochimie Moléculaires et Supramoléculaires (ICBMS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie du CNRS (INC)-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie du CNRS (INC)-École Supérieure Chimie Physique Électronique de Lyon-Centre National de la Recherche Scientifique (CNRS), Instituto de Investigaciones en Físico Química [Córdoba] (INFIQC), Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Facultad de Ciencias Químicas [Córdoba], Universidad Nacional de Córdoba [Argentina]-Universidad Nacional de Córdoba [Argentina], and Université de Lyon
- Subjects
Transition metal ,010405 organic chemistry ,Chemistry ,Intramolecular force ,Organic Chemistry ,[CHIM]Chemical Sciences ,Physical and Theoretical Chemistry ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Combinatorial chemistry ,ComputingMilieux_MISCELLANEOUS ,0104 chemical sciences - Abstract
A novel approach for the synthesis of tetracyclic indoles and 7-azaindoles is reported. The strategy involves four steps, with a fast rt intramolecular α-arylation of ketones as key step. The reaction was inspected synthetically to achieve the synthesis of 11 novel tetracyclic structures with moderate to very good yields (39-85%). Theoretical combined with experimental studies led us to propose a probable polar mechanism (concerted S
- Published
- 2018
- Full Text
- View/download PDF
5. Intra- vs inter-molecular electron transfer processes in C[sbnd]N bond forming reactions. Photochemical, photophysical and theoretical study of 2′-halo-[1,1′-biphenyl]-2-amines
- Author
-
María E. Budén, Silvia M. Barolo, Adriana B. Pierini, Roberto A. Rossi, and Walter D. Guerra
- Subjects
Electron Transfer ,010402 general chemistry ,Photochemistry ,01 natural sciences ,Biochemistry ,Electron transfer ,chemistry.chemical_compound ,Drug Discovery ,Arylation Reaction ,Radical Anions ,Biphenyl ,Radical-nucleophilic aromatic substitution ,010405 organic chemistry ,Chemistry ,Carbazole ,Photochemical ,Otras Ciencias Químicas ,Organic Chemistry ,Intermolecular force ,Ciencias Químicas ,0104 chemical sciences ,Chain length ,Srn1 ,Intramolecular force ,Halo ,CIENCIAS NATURALES Y EXACTAS - Abstract
N-Arylation reaction is obtained when 2′-halo-[1,1′-biphenyl]-2-amines are irradiated in basic medium. On the basis of photochemical, photophysical experiments and computational studies we propose that carbazoles are formed by intermolecular electron transfer via SRN1 mechanism. In general, biphenylamines with an EDG like Me or OMe behave in the same way as H giving both, cyclized and reduced products. On the other hand, biphenylamines containing EWG like CN, COOEt or CF3gave only the corresponding carbazole. Herein, we report for the first time the chain length for the propagation cycle of intramolecular SRN1 reactions and explain that differences in the distribution of products suggest differences regarding the overall mechanism involved. Fil: Guerra, Walter Damián. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Buden, Maria Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Barolo, Silvia Maricel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Rossi, Roberto Arturo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Pierini, Adriana Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
- Published
- 2016
6. ChemInform Abstract: Synthesis of Dibenzosultams by 'Transition-Metal-Free' Photoinduced Intramolecular Arylation of N-Aryl-2-halobenzenesulfonamides
- Author
-
Walter D. Guerra, Roberto A. Rossi, Adriana B. Pierini, and Silvia M. Barolo
- Subjects
chemistry.chemical_compound ,Radical-nucleophilic aromatic substitution ,chemistry ,Transition metal ,Aryl ,Intramolecular force ,Light energy ,Substituent ,General Medicine ,Photochemistry - Abstract
A new and general synthetic route to prepare dibenzosultams is here reported. This approach involves the synthesis of N-aryl-2-halobenzenesulfonamides (3), followed by intramolecular C–C photoinduced arylation under soft conditions without the use of “Transition Metal”. The photostimulated reactions exhibit very good tolerance to different substituent groups with good to excellent isolated yields (42–98%) of products. Moreover, it is shown that LED (λ = 395 nm) is an efficient light energy source to initiate efficiently the reactions. Theoretical inspection of the mechanism was made to probe the involvement of the radical-anion SRN1 process.
- Published
- 2016
- Full Text
- View/download PDF
7. Synthesis of Dibenzosultams by 'Transition-Metal-Free' Photoinduced Intramolecular Arylation of N-Aryl-2-halobenzenesulfonamides
- Author
-
Roberto A. Rossi, Walter D. Guerra, Adriana B. Pierini, and Silvia M. Barolo
- Subjects
Radical-nucleophilic aromatic substitution ,010405 organic chemistry ,Chemistry ,Aryl ,Otras Ciencias Químicas ,Organic Chemistry ,Substituent ,Ciencias Químicas ,Electron Transfer ,010402 general chemistry ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,purl.org/becyt/ford/1 [https] ,chemistry.chemical_compound ,Srn1 ,Transition metal ,Intramolecular force ,Light energy ,Dibenzosultams ,purl.org/becyt/ford/1.4 [https] ,Organic chemistry ,C-N Coupling ,CIENCIAS NATURALES Y EXACTAS - Abstract
A new and general synthetic route to prepare dibenzosultams is here reported. This approach involves the synthesis of N-aryl-2-halobenzenesulfonamides (3), followed by intramolecular C-C photoinduced arylation under soft conditions without the use of "Transition Metal". The photostimulated reactions exhibit very good tolerance to different substituent groups with good to excellent isolated yields (42-98%) of products. Moreover, it is shown that LED (= 395 nm) is an efficient light energy source to initiate efficiently the reactions. Theoretical inspection of the mechanism was made to probe the involvement of the radical-anion SRN1 process. Fil: Guerra, Walter Damián. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Rossi, Roberto Arturo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Pierini, Adriana Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Barolo, Silvia Maricel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
- Published
- 2016
8. Synthesis of 6-Substituted 2-Pyrrolyl and Indolyl Benzoxazoles by Intramolecular O-Arylation in Photostimulated Reactions
- Author
-
Javier F. Guastavino, Victoria A. Vaillard, Silvia M. Barolo, Roberto A. Rossi, Javier I. Bardagi, and María E. Budén
- Subjects
Indole test ,Benzoxazoles ,Indoles ,Chemistry ,Stereochemistry ,Heterocycle ,Organic Chemistry ,O-Arylation ,Chemistry Techniques, Synthetic ,Photostimulated ,Photochemical Processes ,Medicinal chemistry ,Electron Transport ,purl.org/becyt/ford/1 [https] ,Synthesis ,chemistry.chemical_compound ,Intramolecular force ,Liquid ammonia ,purl.org/becyt/ford/1.4 [https] ,Pyrroles ,Pyrrole - Abstract
The synthesis of a series of 6-substituted 2-pyrrolyl and 2-indolyl benzoxazoles by photostimulated C-O cyclization of anions from 2-pyrrole carboxamides, 2-indole carboxamides, or 3-indole carboxamides has been found to proceed in good to excellent yields (41-100%) in DMSO and liquid ammonia. The pyrrole and indole carboxamides are obtained in good to very good isolated yields by an amidation reaction of different 2-haloanilines with 2-carboxylic acid of pyrrole and 2- or 3-carboxylic acid of indole. To explain the regiochemical outcome of these reactions (C-O arylation vs C-N or C-C arylation), a theoretical analysis was performed using DFT methods and the B3LYP functional. Fil: Vaillard, Victoria Anahi. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina Fil: Guastavino, Javier Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina Fil: Buden, Maria Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Bardagi, Javier Ivan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Barolo, Silvia Maricel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Rossi, Roberto Arturo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
- Published
- 2012
- Full Text
- View/download PDF
9. Synthesis of Carbolines by Photostimulated Cyclization of Anilinohalopyridines
- Author
-
Roberto A. Rossi, Gregory D. Cuny, Joydev K. Laha, and Silvia M. Barolo
- Subjects
Aniline Compounds ,Photolysis ,Radical-nucleophilic aromatic substitution ,Molecular Structure ,Photochemistry ,Chemistry ,Otras Ciencias Químicas ,Organic Chemistry ,Ciencias Químicas ,Catalysis ,purl.org/becyt/ford/1 [https] ,Srn1 ,Cyclization ,Ring Closure ,purl.org/becyt/ford/1.4 [https] ,Structural isomer ,Organic chemistry ,CIENCIAS NATURALES Y EXACTAS ,Palladium ,Carbolines - Abstract
A general synthetic route to prepare all four carboline regioisomers by photostimulated cyclization of anilinohalopyridines is described. The methodology affords various substituted carbolines in good to excellent yields. In the case of α-carbolines, the S(RN)1 methodology complements previously reported palladium-catalyzed cyclization approaches. Fil: Laha, Joydev K.. Harvard Medical School; Estados Unidos Fil: Barolo, Silvia Maricel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Rossi, Roberto Arturo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Cuny, Gregory D.. Harvard Medical School; Estados Unidos
- Published
- 2011
- Full Text
- View/download PDF
10. ChemInform Abstract: 'Transition-Metal-Free' Synthesis of Carbazoles by Photostimulated Reactions of 2′-Halo[1,1′-biphenyl]-2-amines
- Author
-
Roberto Arturo Rossi, Walter D. Guerra, Adriana B. Pierini, and Silvia M. Barolo
- Subjects
Biphenyl ,chemistry.chemical_compound ,Transition metal ,Chemistry ,Polymer chemistry ,General Medicine ,Halo - Abstract
The starting materials are generally prepared following the approaches shown for (IIIa) and (XIII).
- Published
- 2015
- Full Text
- View/download PDF
11. Syntheses of Aporphine and Homoaporphine Alkaloids by Intramolecular ortho-Arylation of Phenols with Aryl Halides via SRN1 Reactions in Liquid Ammonia
- Author
-
Gregory D. Cuny, Roberto A. Rossi, Silvia M. Barolo, and Xin Teng
- Subjects
chemistry.chemical_classification ,chemistry.chemical_compound ,chemistry ,Intramolecular reaction ,Tetrahydroisoquinoline ,Yield (chemistry) ,Intramolecular force ,Aryl ,Organic Chemistry ,Aporphine ,Chemical synthesis ,Medicinal chemistry ,Sulfonamide - Abstract
The photostimulated intramolecular ortho-arylation reactions of bromoarenes linked with pendant phenoxy containing N-substituted tetrahydroisoquinolines in liquid ammonia afforded aporphine (54−82% yield) alkaloid derivatives via SRN1 reactions. This strategy was extended for the first time to the synthesis of a homoaporphine derivative (40% yield). Tetrahydroisoquinoline precursors that contained electron-withdrawing groups on nitrogen (i.e., amides, sulfonamides, and carbamates) gave cyclized products, whereas precursors with basic nitrogens (i.e., NH or NMe) either failed to yield cyclized products or gave aporphines in only low yield.
- Published
- 2006
- Full Text
- View/download PDF
12. One-Pot Synthesis of 3-Substituted Isoquinolin-1-(2H)-ones and Fused Isoquinolin-1-(2H)-ones by SRN1 Reactions in DMSO
- Author
-
Silvia M. Barolo, Javier F. Guastavino, and Roberto A. Rossi
- Subjects
Radical-nucleophilic aromatic substitution ,Radical ,Organic Chemistry ,One-pot synthesis ,General Medicine ,Medicinal chemistry ,chemistry.chemical_compound ,Electron transfer ,chemistry ,Methyl Ketone ,Nucleophilic substitution ,Organic chemistry ,Physical and Theoretical Chemistry ,Acetophenone - Abstract
3-Substituted isoquinolin-1-(2H)-ones and fused isoquinolin-1-(2H)-ones have been obtained by the photostimulated SRN1 reactions of 2-iodobenzamide with the enolates of aromatic (acetophenone, 1-(benzo[d][1,3]dioxol-5-yl)ethanone, 1- and 2-naphthyl methyl ketones, and 2-, 3-, and 4-acetylpyridine), aliphatic (1-adamantyl methyl ketone), and cyclic ketones (1- and 2-indanone, α- and β-tetralone, and 1-benzosuberone) in DMSO. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
- Published
- 2006
- Full Text
- View/download PDF
13. One pot synthesis of substituted dihydroindeno[1,2-b]indoles and dihydrobenzo[a]carbazoles by photostimulated reactions ofo-iodoaniline with carbanions by the SRN1 mechanism
- Author
-
Ceciréa Rosales, Roberto A. Rossi, Jorge E. Angel Guio, and Silvia M. Barolo
- Subjects
Radical-nucleophilic aromatic substitution ,Chemistry ,Organic Chemistry ,One-pot synthesis ,Aromatic ketones ,Medicinal chemistry ,O-iodoaniline ,Carbanion - Abstract
The photostimulated reaction of enolate anions of cyclic aromatic ketones such as substituted indan-1-ones and 3,4-dihydro-2H-naphthalen-1-one with o-iodoaniline in DMSO affords 1-, 2-, 3-, and 4-methoxy-5,10-dihydroindeno[1,2-b]indoles (34-40%), 1,2-, 1,4-, and 2,3-dimethoxy-5,10-dihydroindeno[1,2-b]-indoles (31-43%), and 1-, 2-, and 3-methoxy-5,11-dihydro-6H-benzo[a]carbazoles (42-61%) by the SRN1 mechanism in one pot reactions.
- Published
- 2006
- Full Text
- View/download PDF
14. Syntheses of 2-Substituted Indoles and Fused Indoles by Photostimulated Reactions of o-Iodoanilines with Carbanions by the SRN1 Mechanism
- Author
-
and Andrés E. Lukach, Roberto A. Rossi, and Silvia M. Barolo
- Subjects
chemistry.chemical_classification ,Ketone ,Radical-nucleophilic aromatic substitution ,Stereochemistry ,Organic Chemistry ,Medicinal chemistry ,Chemical synthesis ,chemistry.chemical_compound ,Ammonia ,chemistry ,Nucleophile ,Amine gas treating ,Acetophenone ,Carbanion - Abstract
2-Substituted indoles (5a,b and 7) and fused indoles (9a-c, 11a,b, and 12) have been obtained by the S(RN)1 mechanism from photostimulated reactions of o-iodoaniline (1) and 1-halo-2-naphthalen-2-ylamines (3a,b) with enolate ions of acyclic (acetophenone (6), 2- (4a) and 4-acetylpyridine (4b)) and cyclic ketones (1- (8a) and 2-indanone (10a), 1- (8b) and 2-tetralone (10b) and 1-benzosuberone (8c)) in DMSO and liquid ammonia as solvents. The carbanions derived from 4a,b, 8a, and 10b are novel nucleophiles that form new C-C bonds by the S(RN)1 mechanism.
- Published
- 2003
- Full Text
- View/download PDF
15. 'Transition-metal-free' synthesis of carbazoles by photostimulated reactions of 2′-halo[1,1′-biphenyl]-2-amines
- Author
-
Walter D. Guerra, Roberto Arturo Rossi, Adriana B. Pierini, and Silvia M. Barolo
- Subjects
Carbazoles ,Medicinal chemistry ,Dft ,Catalysis ,chemistry.chemical_compound ,Synthesis ,Transition metal ,Computational chemistry ,Transition Elements ,Biphenyl ,Substitution reaction ,Radical-nucleophilic aromatic substitution ,Aniline Compounds ,Molecular Structure ,Heterocycle ,Otras Ciencias Químicas ,Organic Chemistry ,Biphenyl Compounds ,Ciencias Químicas ,Bond formation ,Srn1 ,chemistry ,Metals ,Intramolecular force ,Biphenylamines ,CIENCIAS NATURALES Y EXACTAS - Abstract
An efficient and simple protocol for the preparation of a series of 9H-carbazoles by photostimulated SRN1 substitution reactions is presented. Substituted 9H-carbazoles were synthesized in low to excellent yields (up to 96%) through an intramolecular C-N bond formation of 2′-halo[1,1′-biphenyl]-2-amines by the photoinitiated SRN1 mechanism under mild and "transition-metal-free" conditions. The biphenylamines used as substrates were obtained with isolated yields ranging from 21% to 84% by two approaches: (A) the cross-coupling Suzuki-Miyaura reaction and (B) the radical arylation of anilines. Some key aspects of the proposed mechanism were evaluated at the B3LYP/6-311+G∗ level. Fil: Guerra, Walter Damián. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Rossi, Roberto Arturo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Pierini, Adriana Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Barolo, Silvia Maricel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
- Published
- 2014
- Full Text
- View/download PDF
16. ChemInform Abstract: Synthesis of Pyrido[1,2-a]benzimidazoles by Photo-Stimulated C-N Bond Formation via SRN1 Reactions
- Author
-
You Wang, Gregory D. Cuny, Silvia M. Barolo, and Roberto A. Rossi
- Subjects
Reaction conditions ,Radical-nucleophilic aromatic substitution ,Chemistry ,Intramolecular force ,Yield (chemistry) ,General Medicine ,Bond formation ,Photochemistry ,Medicinal chemistry - Abstract
Optimized reaction conditions are established for an intramolecular SRN1 type cyclization of 2-(2-haloarylamino)pyridines (I) to give pyrido[1,2-a]benzimidazoles in good yield.
- Published
- 2013
- Full Text
- View/download PDF
17. Synthesis of pyrido[1,2-a]benzimidazoles by photo-stimulated C–N bond formation via SRN1 reactions
- Author
-
Roberto A. Rossi, You Wang, Silvia M. Barolo, and Gregory D. Cuny
- Subjects
Benzimidazole ,Radical-nucleophilic aromatic substitution ,Pyrazine ,Chemistry ,Otras Ciencias Químicas ,Organic Chemistry ,Ciencias Químicas ,Bond formation ,Biochemistry ,Medicinal chemistry ,PYRIDO[1,2-a]BENZIMIDAZOLES ,chemistry.chemical_compound ,SRN1 ,PHOTO-STIMULATE ,Drug Discovery ,Liquid ammonia ,Isoquinoline ,HETEROCYCLES ,CIENCIAS NATURALES Y EXACTAS - Abstract
The photo-stimulated cyclization of 2-(2-halophenylamino)pyridines in liquid ammonia afforded pyrido[1,2-a]benzimidazoles via SRN1 mediated C–N bond forming reactions in moderate to excellent yields (58–94%). This general synthetic strategy was also extended to a 2-(2-bromophenylamino)pyrazine to give pyrazino[1,2-a]benzimidazole. Attempts to employ this reaction using N-(2-chlorophenyl)-3-isoquinolinamine, however, resulted in C–C bond formation generating 7H-indolo[2,3-c]isoquinoline. Fil: Barolo, Silvia Maricel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Wang, You. Harvard Medical School; Estados Unidos Fil: Rossi, Roberto Arturo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Cuny, Gregory D.. Harvard Medical School; Estados Unidos. University Of Houston; Estados Unidos
- Published
- 2013
18. ChemInform Abstract: Synthesis of 6-Substituted 2-Pyrrolyl and Indolyl Benzoxazoles by Intramolecular O-Arylation in Photostimulated Reactions
- Author
-
Javier F. Guastavino, Victoria A. Vaillard, Javier I. Bardagi, Roberto A. Rossi, Silvia M. Barolo, and María E. Budén
- Subjects
Chemistry ,Intramolecular force ,General Medicine ,Medicinal chemistry - Abstract
Irradiation of amides of type (I), (IIII), and (V) allows a simple and efficient access to pyrrolyl and indolyl benzoxazoles.
- Published
- 2012
- Full Text
- View/download PDF
19. ChemInform Abstract: Synthesis of Carbolines by Photostimulated Cyclization of Anilinohalopyridines
- Author
-
Joydev K. Laha, Roberto A. Rossi, Gregory D. Cuny, and Silvia M. Barolo
- Subjects
Chemistry ,Structural isomer ,Organic chemistry ,General Medicine ,Combinatorial chemistry - Abstract
It provides a convenient method to prepare all four carboline regioisomers in good to high yields.
- Published
- 2011
- Full Text
- View/download PDF
20. Syntheses of Aporphine and Homoaporphine Alkaloids by Intramolecular ortho-Arylation of Phenols with Aryl Halides via SRN1 Reactions in Liquid Ammonia
- Author
-
Xin Teng, Roberto A. Rossi, Gregory D. Cuny, and Silvia M. Barolo
- Subjects
chemistry.chemical_compound ,Radical-nucleophilic aromatic substitution ,chemistry ,Tetrahydroisoquinoline ,Aryl ,Yield (chemistry) ,Intramolecular force ,Organic chemistry ,General Medicine ,Aporphine ,Aporphines ,Phenols - Abstract
The photostimulated intramolecular ortho-arylation reactions of bromoarenes linked with pendant phenoxy containing N-substituted tetrahydroisoquinolines in liquid ammonia afforded aporphine (54−82% yield) alkaloid derivatives via SRN1 reactions. This strategy was extended for the first time to the synthesis of a homoaporphine derivative (40% yield). Tetrahydroisoquinoline precursors that contained electron-withdrawing groups on nitrogen (i.e., amides, sulfonamides, and carbamates) gave cyclized products, whereas precursors with basic nitrogens (i.e., NH or NMe) either failed to yield cyclized products or gave aporphines in only low yield.
- Published
- 2007
- Full Text
- View/download PDF
21. Syntheses of aporphine and homoaporphine alkaloids by intramolecular ortho-arylation of phenols with aryl halides via SRN1 reactions in liquid ammonia
- Author
-
Silvia M, Barolo, Xin, Teng, Gregory D, Cuny, and Roberto A, Rossi
- Subjects
Dinitrobenzenes ,Alkaloids ,Aporphines ,Molecular Structure ,Phenols ,Ammonia ,Cyclization ,Photochemistry ,Bromobenzenes - Abstract
The photostimulated intramolecular ortho-arylation reactions of bromoarenes linked with pendant phenoxy containing N-substituted tetrahydroisoquinolines in liquid ammonia afforded aporphine (54-82% yield) alkaloid derivatives via SRN1 reactions. This strategy was extended for the first time to the synthesis of a homoaporphine derivative (40% yield). Tetrahydroisoquinoline precursors that contained electron-withdrawing groups on nitrogen (i.e., amides, sulfonamides, and carbamates) gave cyclized products, whereas precursors with basic nitrogens (i.e., NH or NMe) either failed to yield cyclized products or gave aporphines in only low yield.
- Published
- 2006
22. One-Pot Synthesis of Substituted Dihydroindeno[1,2-b]indoles and Dihydrobenzo[a]carbazoles by Photostimulated Reactions of o-Iodoaniline with Carbanions by the SRN1 Mechanism
- Author
-
Silvia M. Barolo, Jorge E. Angel Guio, Cecire Rosales, and Roberto A. Rossi
- Subjects
Radical-nucleophilic aromatic substitution ,Chemistry ,One-pot synthesis ,Organic chemistry ,General Medicine ,O-iodoaniline ,Carbanion - Published
- 2006
- Full Text
- View/download PDF
23. Syntheses of 2-Substituted Indoles and Fused Indoles by Photostimulated Reactions of o-Iodoanilines with Carbanions by the SRN1 Mechanism
- Author
-
Roberto A. Rossi, Silvia M. Barolo, and and Andrés E. Lukach
- Subjects
chemistry.chemical_compound ,Radical-nucleophilic aromatic substitution ,Nucleophile ,Chemistry ,Liquid ammonia ,General Medicine ,Medicinal chemistry ,Acetophenone ,Ion ,Carbanion - Abstract
2-Substituted indoles (5a,b and 7) and fused indoles (9a−c, 11a,b, and 12) have been obtained by the SRN1 mechanism from photostimulated reactions of o-iodoaniline (1) and 1-halo-2-naphthalen-2-ylamines (3a,b) with enolate ions of acyclic (acetophenone (6), 2- (4a) and 4-acetylpyridine (4b)) and cyclic ketones (1- (8a) and 2-indanone (10a), 1- (8b) and 2-tetralone (10b) and 1-benzosuberone (8c)) in DMSO and liquid ammonia as solvents. The carbanions derived from 4a,b, 8a, and 10b are novel nucleophiles that form new C−C bonds by the SRN1 mechanism.
- Published
- 2003
- Full Text
- View/download PDF
24. One-Pot Synthesis of 3-Substituted Isoquinolin-1-(2H)-ones and Fused Isoquinolin-1-(2H)-ones by SRN1 Reactions in DMSO.
- Author
-
Javier F. Guastavino, Silvia M. Barolo, and Roberto A. Rossi
- Published
- 2006
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.