Stereospecific Substitution of Enantiomerically Pure 1-(2-Pyridinyl)ethyl Methanesulfonate with .BETA.-Dicarbony Compounds.
作者:Junichi Uenishi、Masahiro Hamada
DOI:10.1248/cpb.50.697
日期:——
The alkylation of the sodium salt of the malonic acid diester with (R)-1-(2-pyridinyl)ethyl methanesulfonate (2) gave the dimethyl (R)-[1-(2-pyridinyl)ethyl]malonate (3a), stereospecifically. The alkylation reaction of methyl acetoacetate gave the methyl (2'S,2R/2S)-3-oxo-2-[1-(2-pyridinyl)ethyl]butanoate (3d) along with the methyl (S)-3-[1-(2-pyridinyl)ethoxy]-2-butenoate (4d). The acid hydrolysis