摘要:
An efficient enantioselective synthesis of beta,beta-dialkyl alpha-hydroxy gamma-butyrolactones, analogues of pantolactone, has been developed employing a stereoselective Prins reaction of chiral alkylidene morpholinones, as the key step. Enantioselective synthesis of a naturally occurring pantolactone homologue and a spiro analogue of pantolactone was achieved with this protocol. (C) 2003 Elsevier Science Ltd. All rights reserved.