Cationic bis(oxazoline)Cu(II) Lewis acid catalysts. Enantioselective furan Diels-Alder reaction in the synthesis of ent-shikimic acid
作者:David A. Evans、David M. Barnes
DOI:10.1016/s0040-4039(96)02259-9
日期:1997.1
The highly enantioselective Diels-Alder reaction between acryloyl oxazolidinone and furan, catalyzed by cationic bis(4-tert-butyloxazoline)Cu(II) complex 1, is presented. Though the reaction equilibrates rapidly at -20 degrees C, reaction at -78 degrees C permits isolation of the kinetic product mixture. The synthetic utility of the reaction is demonstrated by the conversion of the cycloadduct to ent-shikimic acid. Copyright (C) 1996 Published by Elsevier Science Ltd