An efficient cobalt(I)-catalysed Reformatsky reaction using α-chloro esters has been developed. The catalyst is prepared by reducing the cobalt(II) chloride (5 %)/1,2-bis(diphenylphosphino)ethane (dppe)(5 %)/zinc iodide (10 %) system with zinc metal in acetonitrile in the presence of both the α-chloro ester and the carbonyl compound; good to excellent conversions to β-hydroxy esters are obtained at
A practical and stereoselective reduction of 3-keto-2-methyl esters or 3-keto-2-methyl amides into erythro-3-hydroxy-2-methyl esters or erythro-3-hydroxy-2-methyl amides with NaBH4 catalyzed by MnCl2
作者:Hideaki Fujii、Koichiro Oshima、Kiitiro Utimoto
DOI:10.1016/0040-4039(91)80775-2
日期:1991.10
Erythro-3-hydroxy-2-methylpropionates or erythro-3-hydroxy-2-methylpropionamides were prepared with high stereoselectivity by NaBH4reduction of the corresponding 3-keto esters or 3-keto amides in the presence of a catalytic amount of MnCl2.