A general method for the preparation of enantiomerically pure 2-substituted glycerol derivatives by utilizing l-menthone as a chiral template
作者:Toshiro Harada、Hiroyuki Nakajima、Takayuki Ohnishi、Masahiro Takeuchi、Akira Oku
DOI:10.1021/jo00028a057
日期:1992.1
A general method for preparation of a variety of enantiomerically pure 2-substituted glycerol derivatives 1 was developed by utilizing l-menthone as a chiral template. Spiroacetals 6 derived formally from 2-substituted 2-(trimethylsiloxy)-1,3-propanediols and l-menthone were prepared with high stereoselectivity (> 95% de) either by Grignard reactions of oxospiroacetal 4 or by epoxidation of methylenespiroacetal 5 followed by ring opening with higher order cuprates. Highly stereoselective ring-cleavage reaction of 6 with acetophenone enol trimethylsilyl ether and TiCl4 followed by protection of the resulting diol 10 and subsequent removal of the chiral auxiliary gave 2-substituted glycerol derivatives of high enantiomeric purity.