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639 results on '"Li Jing."'

1. ChemInform Abstract: Efficient Palladium-Catalyzed Synthesis of Sulfonyl-Substituted Vinyl Arenes: Hydrazones Provide the Cross-Coupling Partner and Nucleophile Components

Author

Xin-Xing Wu, Li‐Jing Wang, Pin Gao, Si Chen, Wen-Long Chen, Yong-Min Liang, and Peng-Fei Xu

Subjects
Sulfonyl, chemistry.chemical_classification, Coupling, Aryl, chemistry.chemical_element, Halide, General Medicine, Combinatorial chemistry, Catalysis, chemistry.chemical_compound, chemistry, Nucleophile, Atom economy, Palladium
Abstract

A practical and efficient approach for the synthesis of various sulfonyl-substituted vinyl arenes is reported. In the process, hydrazones provide coupling partners for the Pd-catalyzed cross-coupling with aryl halides and sulfinate salts as nucleophiles, which realizes minimal waste and excellent atom economy.

Published
2015

4. ChemInform Abstract: Fe4I3O24H15: A Novel Semiconductor with High Performance in Photodegradation of Rhodamine B Dyes under Visible Light Irradiation

Author

Datang Li, Jianting Tang, and Li Jing

Subjects
chemistry.chemical_compound, Semiconductor, chemistry, Diffuse reflectance infrared fourier transform, Band gap, business.industry, Visible light irradiation, Rhodamine B, General Medicine, Photochemistry, Photodegradation, business
Abstract

UV/VIS diffuse reflectance spectroscopy indicates that the title compound is a semiconductor with a band gap of about 2.30 eV.

Published
2015

5. ChemInform Abstract: Silver-Catalyzed Carbon-Phosphorus Functionalization of N-(p-Methoxyaryl)propiolamides Coupled with Dearomatization: Access to Phosphorylated Aza-Decenones

Author

Yong-Min Liang, Li‐Jing Wang, Xin-Xing Wu, Yu Xia, Xue-Yuan Liu, and An-Qi Wang

Subjects
chemistry, Phosphorus, Organic chemistry, Phosphorylation, chemistry.chemical_element, Surface modification, General Medicine, Carbon, Catalysis
Abstract

The title transformation involves phosphonation of propiolamides, 5-exo cyclization, and dearomatization.

Published
2015

6. ChemInform Abstract: Facile Synthesis of Halogenated Spiroketals via a Tandem Iodocyclization

Author

Li-Jing Wang, Yi-Feng Qiu, Xue-Yuan Liu, Zihang Qiu, Ying-Xiu Li, Jia Wang, Hai-Tao Zhu, Yong-Min Liang, and Mei-Jin Zhong

Subjects
Tandem, Chemistry, Halide, General Medicine, Metal catalyst, Combinatorial chemistry, Coupling reaction
Abstract

A strategy for the synthesis of spiroketal compounds through a tandem iodocyclization of 1-(2-ethynylphenyl)-4-hydroxybut-2-yn-1-one derivatives is presented. This reaction could proceed under very mild conditions in a short time and avoid the use of expensive and toxic metal catalysts. Moreover, the resulting halides can be further exploited by subsequent palladium-catalyzed coupling reactions, which act as the important intermediates for building other valuable compounds.

Published
2014

7. ChemInform Abstract: Electrophilic ipso-Iodocyclization of N-Benzyl-N-(1-naphthyl)propiolamides: Synthesis of Complex Polycyclic Lactams

Author

Hai-Tao Zhu, Yong-Min Liang, Li‐Jing Wang, Xue-Yuan Liu, and Yi-Feng Qiu

Subjects
Chemistry, Intramolecular force, Electrophile, General Medicine, Medicinal chemistry
Abstract

The first protocol involving a Friedel—Crafts-type reaction combined with an intramolecular electrophilic ipso-iodocyclization of title propiol amides is developed.

Published
2014

9. ChemInform Abstract: Gold-Catalyzed Tandem [3,3]-Propargyl Ester Rearrangement Leading to (E)-1H-Inden-1-ones

Author

Hai-Tao Zhu, Yi-Feng Qiu, Li‐Jing Wang, Xue-Yuan Liu, Yong-Min Liang, and An-Qi Wang

Subjects
Reaction conditions, chemistry.chemical_compound, Tandem, chemistry, Propargyl, Michael reaction, Organic chemistry, Organic synthesis, General Medicine, Catalysis
Abstract

An efficient method for the synthesis of (E)-1H-inden-1-ones using gold-catalyzed tandem [3,3]-propargyl ester rearrangement followed by Michael addition under mild reaction conditions has been developed. The resulting products are important frameworks found in numerous natural products and pharmaceutically active compounds, as well as being valuable intermediates in organic synthesis.

Published
2014

10. ChemInform Abstract: Broensted Acid Catalyzed and NIS-Promoted Cyclization of Diynones: Selective Synthesis of 4-Pyrone, 4-Pyridone, and 3-Pyrrolone Derivatives

Author

Yong-Min Liang, Yu-Ying Ye, Yi-Feng Qiu, Mei-Jin Zhong, Li-Jing Wang, Fang Yang, Zihang Qiu, and Bo Song

Subjects
chemistry.chemical_compound, chemistry, Acid catalyzed, Organocatalysis, Halogenation, Organic chemistry, General Medicine, 4-Pyrone, 4-Pyridone, Pyrrole derivatives
Abstract

The obtained iodo-pyridones and -pyrrolones can be easily further converted, for example via Suzuki cross-coupling.

Published
2014

11. ChemInform Abstract: α-Regioselective Construction of gem-Bisprenyl Structures via Zinc-Mediated Prenylation of Esters in THF

Author

Li-Jing Wan, Li-Ming Zhao, Feng-Yan Ma, Rui Sun, and Shu-Qing Zhang

Subjects
Steric effects, Addition reaction, chemistry.chemical_compound, Prenylation, Chemistry, Bromide, Stereochemistry, Reagent, Regioselectivity, chemistry.chemical_element, General Medicine, Zinc, Medicinal chemistry
Abstract

The in situ generated prenylzinc reagent from the reaction of zinc with prenyl bromide has been shown to undergo a new type of α-regioselective addition reaction with a wide range of esters that affords gem-bisprenyl structures. The reaction proceeds under mild conditions to provide α,α′-adducts with complete α-regioselectivity. A mechanism with the consideration of the steric factors is proposed to account for the regioselective results.

Published
2013

40. ChemInform Abstract: Facile Synthesis of 2-Iodo-spiro[indene-1,1′-isobenzofuran]-3′-ones via Iodine-Promoted Cascade Cyclization

Author

Xue Dong, Mei-Jin Zhong, Hai-Tao Zhu, Yong-Min Liang, Xue-Yuan Liu, and Li‐Jing Wang

Subjects
chemistry.chemical_compound, chemistry, Isobenzofuran, chemistry.chemical_element, General Medicine, Indene, Iodine, Medicinal chemistry, Benzoates
Abstract

A novel method is elaborated for the synthesis of spiro derivatives (II) by iodine-mediated cyclization of benzoates (I).

Published
2013

41. ChemInform Abstract: Synthesis of 3,4-Dihalogenated Furan-2-(5H)-ones by Electrophilic Cyclization of 4-Hydroxy-2-alkynoates

Author

Ke-Gong Ji, Li‐Jing Wang, Hai-Tao Zhu, Yong-Min Liang, and Xue-Yuan Liu

Subjects
chemistry.chemical_compound, chemistry, Furan, Product (mathematics), Halogen, Electrophile, Halide, Halogenation, General Medicine, Medicinal chemistry, Coupling reaction
Abstract

Functionalized 3,4-dihalogenated furan-2(5?H)-ones can be readily prepared in moderate to good yields by treating 4-hydroxy-4-arylbut-2-ynoate derivatives with ICl, IBr, and I2. Both halogen atoms of the electrophile are incorporated in the product. The resulting halides can further afford polycyclic aromatic compounds using known palladium-catalyzed coupling reactions.

Published
2013

42. ChemInform Abstract: High Regiocontrol in the Zinc-Mediated Crotylation of Aldehydes and Ketones: A Straightforward and Facile Approach to Linear Homoallylic Alcohols in DMPU

Author

Hai-Shan Jin, Li-Ming Zhao, Shu-Qing Zhang, and Li-Jing Wan

Subjects
Solvent, Addition reaction, chemistry.chemical_compound, Crotyl, DMPU, chemistry, Bromide, Substrate (chemistry), chemistry.chemical_element, Context (language use), General Medicine, Zinc, Combinatorial chemistry
Abstract

The α-regioselectivity of carbonyl crotylation is a long-standing problem in the realm of C–C bond formation reactions. We demonstrate that zinc-mediated crotylation of aldehydes and ketones can afford α-linear homoallylic alcohols exclusively to provide a simple solution for this problem. In this context, we describe a method for the α-regioselective crotylation of aldehydes and ketones by using an easily available starting material, such as crotyl bromide, zinc dust, and the less-toxic solvent DMPU. The reaction has broad substrate scope and is highly efficient. Moreover, a metallo-[3,5]-sigmatropic rearrangement is proposed to account for the high α-regioselectivity in the zinc-mediated crotylation.

Published
2012

43. ChemInform Abstract: Highly Regioselective Synthesis of 1,3-Diiodonaphthalene Derivatives via a Sequential Cascade Iodocyclization

Author

Xue-Yuan Liu, Yong-Min Liang, Hai-Tao Zhu, Fang Yang, Lei Lu, and Li‐Jing Wang

Subjects
chemistry.chemical_compound, Chemistry, Cascade, Yield (chemistry), Halogenation, Moiety, Regioselectivity, General Medicine, Combinatorial chemistry, Naphthalene
Abstract

A novel and flexible sequentially cascade iodocyclization for the synthesis of highly substituted 1,3-diiodinated naphthalene derivatives in up to 99% yield under mild conditions is reported. The dihalogenated moiety can be readily introduced into the naphthalenes in a position that is usually not easily functionalized.

Published
2012

46. ChemInform Abstract: General and Highly α-Regioselective Zinc-Mediated Prenylation of Aldehydes and Ketones

Author

Li-Ming Zhang, Li-Jing Wan, Li-Ming Zhao, and Hai-Shan Jin

Subjects
chemistry.chemical_compound, Prenylation, Chemistry, Bromide, Organic chemistry, Regioselectivity, chemistry.chemical_element, General Medicine, Zinc
Abstract

Treatment of aldehydes and ketones with prenyl bromide under conditions A) allows facile, efficient, and general access to α-prenylated alcohols.

Published
2011

47. ChemInform Abstract: Electrophilic Carbocyclization of Aryl Propargylic Alcohols: A Facile Synthesis of Diiodinated Carbocycles and Heterocycles

Author

Ke-Gong Ji, Hai-Tao Zhu, Li-Jing Wang, Xue-Yuan Liu, Fang Yang, Yong-Min Liang, Shaukat Ali, and Shu-Chun Zhao

Subjects
chemistry.chemical_compound, chemistry, Aryl, Electrophile, Oxidizing agent, food and beverages, chemistry.chemical_element, Organic chemistry, Halogenation, General Medicine, Iodine, Oxygen, Coupling reaction
Abstract

Diiodinated carbocycles and oxygen heterocycles can be readily synthesized by electrophilic carbocyclization of aryl propargylic alcohols in moderate to good yields under mild conditions. The resulting diiodide can be further exploited by subsequent oxidizing and coupling reactions. Both the iodine anion and cation generated from I(2) are used effectively. The presence of a trace amount of water is essential for this electrophilic cyclization.

Published
2011

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