乙酸酐 、
(2S,5R)-2-((3R,5R,8R,9R,10R,13R,14R,17S)-3-Hydroxy-4,4,8,10,14-pentamethyl-hexadecahydro-cyclopenta[a]phenanthren-17-yl)-6-methyl-hept-6-ene-2,5-diol 在
吡啶 作用下,
以103 mg的产率得到Acetic acid (5R,8R,9R,10R,13R,14R,17S)-17-((S)-4-acetoxy-1-hydroxy-1,5-dimethyl-hex-5-enyl)-4,4,8,10,14-pentamethyl-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester