Design of .alpha.-alkyl-.beta.-hydroxy esters suitable for providing optical resolution by lipase hydrolysis
摘要:
A study of the lipase-catalyzed hydrolyses of various alpha-substituted beta-acetoxy esters revealed that a sulfur functional group in the ester, which could play an important role in the stereorecognition by lipase A6 (Aspergillus sp.) and an anti conformation in the ester, promotes satisfactory results in the hydrolysis.
Design of .alpha.-alkyl-.beta.-hydroxy esters suitable for providing optical resolution by lipase hydrolysis
摘要:
A study of the lipase-catalyzed hydrolyses of various alpha-substituted beta-acetoxy esters revealed that a sulfur functional group in the ester, which could play an important role in the stereorecognition by lipase A6 (Aspergillus sp.) and an anti conformation in the ester, promotes satisfactory results in the hydrolysis.
selective aldol reaction mediated by boron compounds and a mild organic base (DBU) was developed. Inclusion of electron-withdrawing groups in the amino acid derivative ligands reacted with BH3·SMe2 forms a boron promoter with increased Lewis acidity at the boron atom and facilitated the carboxylic acid selective enolate formation, even in the presence of other carbonyl groups such as amides, esters, ketones
A study of the lipase-catalyzed hydrolyses of various alpha-substituted beta-acetoxy esters revealed that a sulfur functional group in the ester, which could play an important role in the stereorecognition by lipase A6 (Aspergillus sp.) and an anti conformation in the ester, promotes satisfactory results in the hydrolysis.