Acetic acid (8R,9S,13S,14S,17S)-17-azidomethyl-3-methoxy-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl ester 在
焦磷酸硫胺素 作用下,
以
苯 为溶剂,
以80%的产率得到17β,1'-Spiro-(2'-methyl-2'-oxazolino)-oestra-1,3,5(10)-trien-3-methylether