ENANTIOSELECTIVE ALLYLIC OXIDATION CATALYZED BY CHIRAL BISOXAZOLINE-COPPER COMPLEXES

被引:155
作者
GOKHALE, AS
MINIDIS, ABE
PFALTZ, A
机构
[1] UNIV BASEL,INST ORGAN CHEM,CH-4056 BASEL,SWITZERLAND
[2] UNIV BASEL,INST PHARMAZEUT,CH-4051 BASEL,SWITZERLAND
关键词
D O I
10.1016/0040-4039(95)00140-8
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Copper(I) complexes prepared in situ rom chiral bisoxazolines and Cu(I)OTf have been studied as catalysts for the allylic oxidation of cycloalkenes, Using 5 mol% of catalyst and tert-butyl perbenzoate as oxidant, optically active 2-cycloalkenyl benzoates were obtained in moderate to good yields. The highest enantiomeric excesses, 74% at 23 degrees C and up to 84% at lower temperatures, were observed for cyclopentene and cycloheptene, while cyclohexene gave somewhat lower selectivities ranging between 64-77%ee,
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页码:1831 / 1834
页数:4
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