Organocatalytic Redox Isomerization of Electron-Deficient Allylic Alcohols: Synthesis of 1,4-Ketoaldehydes
作者:Keshab Mondal、Buddhadeb Mondal、Subhas Chandra Pan
DOI:10.1021/acs.joc.6b00243
日期:2016.6.3
An organocatalytic redox isomerization strategy has been developed for the synthesis of 1,4-ketoaldehydes. DABCO was found to be the best catalyst for the isomerization of γ-hydroxy enones. With 20 mol % of DABCO as catalyst and DMSO as the solvent high yields have been achieved for different 1,4-ketoaldehydes.
Organocatalytic Asymmetric Synthesis of Cyclic Acetals with Spirooxindole Skeleton
作者:Amit Shikari、Koushik Mandal、Deepak Chopra、Subhas Chandra Pan
DOI:10.1002/adsc.202101057
日期:2022.1.4
An organocatalyticasymmetricsynthesis of cyclic acetal with spirooxindole skeleton has been developed via a dominoreaction between isatin and γ-hydroxy enones. Bifunctional squaramide catalyst with adamantyl motif was found to be the most effective for the cascade reaction. With 10 mol% of the catalyst, the desired products were obtained in 1.8:1 to 9:1 diastereo- and 86% to >99% enantioselectivities
A Telescoped Continuous Flow Enantioselective Process for Accessing Intermediates of 1-Aryl-1,3-diols as Chiral Building Blocks
作者:Aitor Maestro、Bence S. Nagy、Sándor B. Ötvös、C. Oliver Kappe
DOI:10.1021/acs.joc.3c02040
日期:2023.11.3
is reported for the enantioselective synthesis of chiral precursors of 1-aryl-1,3-diols, intermediates in the synthesis of ezetimibe, dapoxetine, duloxetine, and atomoxetine. The two-step sequence consists of an asymmetric allylboration of readily available aldehydes using a polymer-supported chiral phosphoric acid catalyst to introduce asymmetry, followed by selective epoxidation of the resulting alkene
Organocatalytic Synthesis of Furan-Embedded Styrene Atropisomers
作者:Chandrakanta Parida、Subhas Chandra Pan
DOI:10.1021/acs.joc.3c01391
日期:2023.9.15
synthesis of furan-embedded styrene atropisomers via the reaction between 1-(aryl-ethynyl)-naphthalen-2-ol and γ-hydroxyenone. The reaction proceeds through in situ furan formationfrom γ-hydroxyenone. The styrenederivatives were obtained in moderate to good yields with high diastereoselectivities with a catalytic amount of PTSA. Few applications such as triazole formation and cross-coupling reactions