2-methylene 1,3-dithiane 、
3β-acetoxy-12-oxo-23,24-dinor-5β-chol-20-en-22-al 在
Eu(III)-tris(1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octanedionate)-d
27 作用下,
以
氯仿 为溶剂,
反应 18.0h,
以96%的产率得到Acetic acid (5R,8R,9S,10S,13S,14S)-10,13-dimethyl-17-(7-oxa-1,5-dithia-spiro[5.5]undec-8-en-9-yl)-12-oxo-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester