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Your search keyword '"Rupak Chakraborty"' showing total 4 results
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4 results on '"Rupak Chakraborty"'

1. Surface-mediated solid phase reaction. Aldol reaction of silyl enol ethers with aldehydes on a solid surface of neutral alumina: selectivity for anti aldols

Author

Rupak Chakraborty and Brindaban C. Ranu

Subjects
Silylation, Chemistry, organic chemicals, Sonication, Solid surface, Organic Chemistry, Biochemistry, Enol, Solvent, chemistry.chemical_compound, Aldol reaction, Drug Discovery, polycyclic compounds, Organic chemistry, lipids (amino acids, peptides, and proteins), Aldol condensation, Selectivity
Abstract

The aldol reaction of trimethyl silyl enol ethers with aldehydes on the solid surface of neutral alumina under sonication without any solvent is found to proceed providing cross aldol products with anti selectivity.

Published
1993
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2. Reduction of conjugated nitroalkenes with zinc borohydride. A mild method for converting monosubstituted nitroalkenes to nitroalkanes and disubstituted ones to oximes

Author

Rupak Chakraborty and Brindaban C. Ranu

Subjects
chemistry.chemical_classification, Organic Chemistry, Nitro compound, chemistry.chemical_element, Zinc, Conjugated system, Borohydride, Biochemistry, Medicinal chemistry, Reduction (complexity), chemistry.chemical_compound, chemistry, Drug Discovery, Chemical reduction, Aliphatic compound
Abstract

Mono-β-substituted conjugated nitroalkenes are readily reduced by zinc borohydride in 1,2-dimethoxyethane to the corresponding nitroalkanes, whereas the disubstituted ones furnish the corresponding oximes in excellent yields.

Published
1992
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3. α-Hydroxycyclobutane rearrangement followed by retroaldol cleavage: A novel and powerful technology for the stereocontrolled construction of carbocyclic systems. An easy access to angularly functionalised trans-fused cycloheptanoids

Author

Rupak Chakraborty, Manas K. Basu, and Brindaban C. Ranu

Subjects
Acid catalysis, Bicyclic molecule, Chemistry, Stereochemistry, Organic Chemistry, Drug Discovery, Aldol condensation, Cleavage (embryo), Biochemistry, Reversible reaction
Abstract

Acid-catalysed rearrangement of α-hydroxycyclobutane derivatives 7a–7c and 11a–11c followed by retroaldol cleavage and oxidation in a single operation furnish angularly carboxylated trans-fused cycloheptanoid derivatives 9a–9c and 12a–12c in good yields.

Published
1992
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4. Studies on oxygen heterocycles

Author

Dipak Chandra Sarkar, Indira Datta, Rupak Chakraborty, Somnath Ghosh, Tapas Kumar Das, and Judhajit Sengupta

Subjects
chemistry.chemical_compound, chemistry, Yield (chemistry), Organic Chemistry, Drug Discovery, Trifluoroacetic acid, Side chain, Organic chemistry, chemistry.chemical_element, Photochemical decomposition, Photochemistry, Biochemistry, Oxygen
Abstract

Trifluoroacetic acid catalysed reaction of 2-methoxyphenyldiazometliylketone ( 4 a), 2-acetoxyphenyldiazomethylketone ( 4 b) and 3-(2-anisyl)-∞-diazo-2-propanone ( 11 ) leads to the formation of coumaranone ( 6 ) and 3-chromanone ( 12 ), while 4-(2-anisyl)-∞-diazo-2-butanone ( 16 ) affords benzco[b]-1-oxepan-3-one ( 17 ) and 5-methoxy-2-tetralone ( 18 ) in moderate yield. The photochemical decomposition of the said diazoketoneg ( 4 a, 11 and 16 ) gave products depending on the length of the side chain present in the substrates.

Published
1989
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