Acetic acid (3S,10R,13S,17S)-17-chlorocarbonyl-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl ester 、
5-(1-hydroxyethyl) furo[2,3-c]pyridine 在
5-(1-hydroxyethyl) furo[2,3-c]pyridine 作用下,
以57的产率得到3β-acetoxy-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthrene-17-carboxylic acid 1-(furo[2,3-c]pyridin-5-yl)ethyl ester