Enantioselective Enzymatic Desymmetrization of Prochiral Allenic Diols
作者:Chicco Manzuna Sapu、Jan-E. Bäckvall、Jan Deska
DOI:10.1002/anie.201103227
日期:2011.10.4
Crude lipase from porcine pancreas acts as a highly efficient biocatalyst in the enantioselective transesterification of prochiral allendiols. Following a simple synthetic protocol, highly functionalized axially chiral allenes are obtained in high yields and excellent enantiopurity (see scheme).
This invention provides cholesterol absorption inhibitors of Formula I:
and the pharmaceutically acceptable salts and esters thereof. The compounds are useful for lowering plasma cholesterol levels, particularly LDL cholesterol, and for treating and preventing atherosclerosis and atherosclerotic disease events.
This invention provides cholesterol absorption inhibitors of Formula I:
and the pharmaceutically acceptable salts thereof, wherein R
12
is an alkyl, alkeny or alkynyl group mono- or poly-substituted with —OH, —COOH or a combination of —OH and —COOH, and R
9
contains an alkyl, alkeny or alkynyl group substituted with a heterocyclic ring, amino or sulfonyl. The compounds are useful for lowering plasma cholesterol levels, particularly LDL cholesterol, and for treating atherosclerosis and preventing atherosclerotic disease events.
Enantioselective Synthesis of Axially Chiral Tetrasubstituted Allenes via Lipase-Catalyzed Desymmetrization
作者:Jan Deska、Matthias Hammel
DOI:10.1055/s-0032-1317524
日期:——
transesterification of prochiral tetrasubstituted allenic diols yielding highly enantioenriched axiallychiral allenyl monoesters. In combination with subsequent 5-endo-trig cyclizations geminally disubstituted dihydrofurans are accessible in high optical purity. Lipase from Pseudomonas fluorescens efficiently catalyzes the transesterification of prochiral tetrasubstituted allenic diols yielding highly
This invention provides cholesterol absorption inhibitors of Formula I:I and the pharmaceutically acceptable salts thereof. The compounds are useful for lowering plasma cholesterol levels, particularly LDL cholesterol, and for treating and preventing atherosclerosis and atherosclerotic disease events.