enantioselective catalytic kinetic resolution of allylic alcohols through asymmetric isomerization with chiralBINOL derivatives-based alkoxides as bifunctional Brønsted base catalysts were described in the study. A number of chiralBINOL derivatives-based alkoxides were synthesized, and their structure-enantioselectivity correlation study in asymmetric isomerization identified a promising chiral Brønsted
Beyond the Corey–Chaykovsky Reaction: Synthesis of Unusual Cyclopropanoids via Desymmetrization and Thereof
作者:Kaushalendra Patel、Uttam K. Mishra、Dipto Mukhopadhyay、S. S. V. Ramasastry
DOI:10.1002/asia.201901108
日期:2019.12.13
Desymmetrization-based protocols for the synthesis of highly functionalized indeno-spirocyclopropanes and cyclopropa-fused indanes have been established through unexpected reactions triggered by the Corey-Chaykovsky reagent. These structures were further elaborated in one step to privileged scaffolds such as fluorenones, indenones, and naphthaphenones. For instance, an acid-catalyzed transformation
Reactions of new alpha-ketostabilized phosphorus ylides of the type Ph3P = CHC(O)R (R = 2,4-dichlorophenyl (O) and 4-isopropylphenyl (L-2)) with AgNO(3)and Hg(NO3)(2).H2O, using methanol as a solvent, are reported. The crystal structures of L-2 and [Ag(L-2)(2)(NO3)] (2) have been determined. Characterization of the obtained compounds was also performed by elemental analysis. IR, H-1, P-31 and C-13 NMR. Theoretical studies were carried out on the silver(I) complexes. It was shown that the nitrate ion shows a bonding interaction with the silver ion. (C) 2012 Elsevier Ltd. All rights reserved.
Organocatalytic Enantioselective Selenosulfonylation of a C–C Double Bond To Form Two Stereogenic Centers in an Aqueous Medium
Organocatalytic selenosulfonylation of the C–C doublebond of α,β-unsaturatedketones to construct two contiguous stereogenic centers in an aqueous medium was described. A series of α-selenyl and β-sulfonyl ketones with various functional groups were synthesized in good yields and enantioselectivities with saturated NaCl solution as the solvent. In addition, this protocol had been successfully scaled