Hypervalent-iodine induced quasi-Favorskii C-ring contraction of 12-oxosteroids: A shortcut to C-norsteroids
摘要:
Treatment of 12-oxosteroids with PhI(OAc)(2) and KOH in refluxing methanol triggers a quasi-Favorskii C-ring contraction leading to the corresponding 11 alpha-alcoxycarbonyl-C-norsteroids in moderate yields. This constitutes the first one-step synthetic alternative to C-norsteroids starting from 12-oxosteroids. (C) 2012 Elsevier Inc. All rights reserved.