三光气 、
(3R,5S,8R,9S,10S,13S,14S)-3-hydroxy-10,13-dimethyl-3-(((4-(trifluoromethyl)benzyl)amino)methyl)hexadecahydro-17H-cyclopenta[a]phenanthren-17-one 在
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
以43%的产率得到(3R,5S,8R,9S,10S,13S,14S)-10,13-dimethyl-3'-[4-(trifluoromethyl)benzyl]tetradecahydro-2'H-spiro[cyclopenta[a]phenanthrene-3,5'-[1,3]oxazolidine]-2',17(2H)-dione