Enantiomerically pure acetals in organic synthesis. 2. Diastereoselective alkylation of enantiomeric lithio alkyl lactyl tetrahydropyranosides and related enolates
作者:Eugene A. Mash、James A. Fryling
DOI:10.1021/jo00003a035
日期:1991.2
A concise approach for the rapid synthesis of enantiomerically pure alpha-alkylated derivatives of lactate esters and of other enantiomerically pure alpha-hydroxy esters is presented. This methodology, which makes use of enantiomeric lithium enolates prepared from diastereomeric tetrahydropyranyl ethers derived from alkyl lactates and other alpha-hydroxy esters, is used to prepare both enantiomers of frontalin from (S)-(-)-methyl lactate.