Asymmetric synthesis of 1α,25-dihydroxyvitamin D3 A-ring precursor starting with 5-tert-butyldimethylsiloxy-2-cyclohexenone
作者:Georges P.J Hareau、Masakazu Koiwa、Fumie Sato
DOI:10.1016/s0040-4039(00)00169-6
日期:2000.4
The A-ring precursor of 1 alpha,25-dihydroxyvitamin D-3 [(E)-4] has been prepared starting from the (5S)-tert-butyldimethylsiloxy-2-cyclohexenone [(S)-1] via eight steps in 19% overall yield, where a catalytic osmium dihydroxylation which sets the stereochemistry of the hydroxyl group at C-1 and a regioselective protection of the hydroxy group as a TBS-ether are the key steps. (C) 2000 Elsevier Science Ltd. All rights reserved.