Highly Diastereoselective Sequential Michael-Aldol Reactions of Methyl 2-Chloro-2-cyclopropylideneacetate with Grignard Reagents and Aldehydes
作者:Armin de Meijere、Suryakanta Dalai、Michael Limbach、Ligang Zhao、Markus Tamm、Madhumati Sevvana、Viktor V. Sokolov
DOI:10.1055/s-2006-926276
日期:——
Grignardreagents, especially isopropylmagnesium chloride, smoothly undergo Michael addition onto methyl 2-bromo- and 2-chloro-2-cyclopropylideneacetate (1-C1), and the thus formed magnesium enolates are particularly efficiently trapped with aromatic aldehydes. This one-pot reaction provides highly substituted chlorohydrines, mostly in high yields (10 out of 18 examples with 72-92%) and as pure (2S*