ENANTIOSELECTIVE PREPARATION OF BETA-ALKYL-GAMMA-BUTYROLACTONES FROM FUNCTIONALIZED KETENE DITHIOACETALS

被引:130
作者
KOCH, SSC [1 ]
CHAMBERLIN, AR [1 ]
机构
[1] UNIV CALIF IRVINE, DEPT CHEM, IRVINE, CA 92717 USA
关键词
D O I
10.1021/jo00062a013
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
An efficient and general enantioselective synthesis of beta-alkyl-gamma-butyrolactones has been developed. The key step of this procedure is an oxazolidinone-directed alkylation of a lithiated ketene dithioacetal that proceeds with excellent regiochemical control and high diastereofacial selectivity. Reductive removal of the chiral auxiliary followed by acid-induced cyclization of the resultant hydroxy ketene dithioacetal gives the enantiomerically pure beta-alkyl-gamma-butyrolactone.
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页码:2725 / 2737
页数:13
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