Synthesis of Monothiomalonates - Versatile Thioester Enolate Equivalents for C-C Bond Formations
作者:Oliver D. Engl、Jakub Saadi、Elena Cosimi、Helma Wennemers
DOI:10.1002/hlca.201700196
日期:2017.11
surrogates of thioester enolates that allow for stereoselective C–C bond formations under mild conditions and thereby afford access to synthetically versatile thioester derivatives. Here we present a straightforward synthetic route to MTMs that proceeds through nucleophilicring‐opening of Meldrum's acid derivatives followed by O‐alkylation of the resulting malonic acid half thioesters with alkyl triflates
Mono thiomalonates as thioester enolate equivalents—enantioselective 1,4-addition reactions to nitroolefins under mild conditions
作者:Paolo Clerici、Helma Wennemers
DOI:10.1039/c1ob06638b
日期:——
Mono thiomalonates (MTMs) are introduced as thioester enolate equivalents. Asymmetric organocatalyzed conjugate addition reactions to nitroolefins proceed under mild conditions to afford synthetically useful γ-nitrothioesters with excellent yields and enantioselectivities.
A straightforward stereoselectivesynthesis route to indolin-3-yl acetates has been developed using organocatalytic addition reactions of monothiomalonates to ortho-bromo nitrostyrenes as the key step. The addition products of this highlystereoselectiveone-pot addition–deprotection–decarboxylation sequence were easily further converted to the target indolin-3-yl acetates, via an intramolecular Buchwald–Hartwig