作者:Pelayo Camps、Sílvia Giménez
DOI:10.1016/0957-4166(96)00129-2
日期:1996.4
Reaction of rac-alpha-substituted arylacetyl chlorides with (R)- and (S)-3-hydroxy-4,4-dimethyl-1-phenyl-2-pyrrolidinone under standard esterification conditions, gave esters (3R,alpha R)- and (3S,alpha S)-3, respectively, with a diastereoselectivity which diminishes on increasing the steric effect of the alpha-substituent. Controlled acidic hydrolysis of esters 3 afforded the corresponding acids 4 with minimal racemization. Boron tribromide demethylation of (R)- and (S)-4d gave without racemization the hydroxyacids (R)- and (S)-4e, known precursors of (R)- and (S)-iodoalphionic acid. Copyright (C) 1996 Elsevier Science Ltd