(3β,5α,22E)-3-(1-ethoxyethoxy)-4,4-dimethylergosta-8(14),22-dien-15-one 、
碘甲烷 在
potassium tert-butylate 作用下,
生成 (3S,5R,9R,10R,13R,14R,17R)-3-(2-Ethoxy-ethoxy)-4,4,10,13,14-pentamethyl-17-((E)-(1R,4R)-1,4,5-trimethyl-hex-2-enyl)-1,2,3,4,5,6,9,10,11,12,13,14,16,17-tetradecahydro-cyclopenta[a]phenanthren-15-one