An Exceptionally Mild Catalytic Thioester Aldol Reaction Inspired by Polyketide Biosynthesis
摘要:
This report details our discovery of a new catalytic ester aldol reaction using malonic acid half thioesters (MAHTs) that directly affords beta-hydroxythioesters. The reaction is catalyzed by combination of a Cu(II) salt and an amine base, and it can be performed under exceptionally mild conditions (23 degrees C, open to the air, wet solvent). Methyl malonic acid half thioesters afforded syn aldol products with distereoselectivities greater than 6:1.
An Exceptionally Mild Catalytic Thioester Aldol Reaction Inspired by Polyketide Biosynthesis
作者:Gojko Lalic、Allen D. Aloise、Matthew D. Shair
DOI:10.1021/ja029452x
日期:2003.3.1
This report details our discovery of a new catalytic ester aldol reaction using malonic acid half thioesters (MAHTs) that directly affords beta-hydroxythioesters. The reaction is catalyzed by combination of a Cu(II) salt and an amine base, and it can be performed under exceptionally mild conditions (23 degrees C, open to the air, wet solvent). Methyl malonic acid half thioesters afforded syn aldol products with distereoselectivities greater than 6:1.
Cu(II)-catalyzed enantioselective aldol condensation between malonic acid hemithioesters and aldehydes
A mild, decarboxylative, aldol-type addition of malonicacid hemithioesters to aldehydes has been shown to occur with up to 39% enantioselectivity when the reaction was carried out in the presence of catalytic amounts of a Cu(II) salt, an enantiopure, tartaric acid-derived bis-benzimidazole and an achiral base.