The first catalytic asymmetric homo-aldol reaction of ethyl
pyruvate leading to diethyl-2-hydroxy-2-methyl-4-oxoglutarate in up to 96%
enantiomeric excess is reported; this reaction has been investigated for
various catalysts, amines and solvents, and it is demonstrated that this
new reaction leads to a simple synthetic procedure for the formation of
optically active isotetronic acid derivatives.
Highly selective photoinduced dimerization of alkyl pyruvates catalyzed by cobaloxime
作者:Masashi Kijima、Kiyokatsu Miyamori、Takeo Sato
DOI:10.1021/jo00243a022
日期:1988.4
Direct catalytic asymmetric aldol reactions of pyruvates: scope and mechanism
作者:Nicholas Gathergood、Karsten Juhl、Thomas B. Poulsen、Karl Thordrup、Karl Anker Jørgensen
DOI:10.1039/b316092k
日期:——
different chiral Lewis acids as the catalyst, amines, ratios of chiral bisoxazoline copper(II) salts:amine, and solvents gave up to 96% ee of the isotetronic acid. Then the reaction was extended to a cross-aldol reaction of various 2-ketoesters with activated carbonyl compounds to give the cross-aldol adduct with excellent enantiomericexcess. Furthermore, the synthesis of the isotetronic acids was investigated