(2R,4aS,4bS,6aR,8S,10aS,12aS)-8-(tert-Butyl-dimethyl-silanyloxy)-2-(2-[1,3]dithian-2-yl-ethyl)-2,7,7,10a,12a-pentamethyl-2,3,4a,4b,5,6,6a,7,8,9,10,10a,12,12a-tetradecahydro-chrysene-1,4-dione 在
lithium tri-t-butoxyaluminum hydride 作用下,
以
四氢呋喃 为溶剂,
反应 12.0h,
以70%的产率得到(1S,2R,4aS,4bS,6aR,8S,10aS,12aS)-8-(tert-Butyl-dimethyl-silanyloxy)-2-(2-[1,3]dithian-2-yl-ethyl)-1-hydroxy-2,7,7,10a,12a-pentamethyl-2,3,4a,4b,5,6,6a,7,8,9,10,10a,12,12a-tetradecahydro-1H-chrysen-4-one