Citation: Xing Ping LIU, Yu Lin LI, Xiao Tian LIANG. PREVOST-WOODWARD HYDROXYLATION OF 3, 5-CYCLO-24S-ETHYL-CHOLEST-22-EN-6-ONE[J]. Chinese Chemical Letters, ;1990, 1(1): 25-26. shu

PREVOST-WOODWARD HYDROXYLATION OF 3, 5-CYCLO-24S-ETHYL-CHOLEST-22-EN-6-ONE

a Institute of Organic Chemistry Lanzhou University Lanzhou 730000;
b Institute of Materia Medica Nan-wei Road Beijing 100050

Received Date: 25 August 1989

Preost-Woodward hydroxylation of 2 gave the 22S, 23S-glycol(3), contrary to expectation.It is suggested that the formation of the two possibleiodonium ions(4a and 4b)are reversible, thus allowing the discriminatoryacetoxy group to follow the less hindered route, reacting with 4a virtuallyexclusively.
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