作者:Yongguo Yu、Yun He、Yi Zhao、Li Hai、Yong Wu
DOI:10.1016/j.steroids.2013.09.009
日期:2013.12
We set out to describe a new and efficient route for preparing Ulipristal acetate with a good yield. The selected epoxidization conditions gave out 80% of 5 alpha,10 alpha-epoxide 2a in the two diastereoisomers which greatly improved the yield of 11 beta-substituted isomer 4a. And phenyl-sulfinyl compound 6 was synthesized from ketone 5 directly treated with phenylsulfenyl chloride in the presence of triethylamine. These synthetic procedures is only 8 steps, less than currently reported in the literature, but more suitable for industrial process. (C) 2013 Elsevier Inc. All rights reserved.