Toluene-4-sulfonic acid (S)-3-[(3S,8S,9S,10R,13R,14S)-10,13-dimethyl-3-(tetrahydro-pyran-2-yloxy)-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]-butyl ester 在
sodium iodide 作用下,
以
丙酮 为溶剂,
反应 4.0h,
以390 mg的产率得到2-[(3S,8S,9S,10R,13R,14S)-17-((S)-3-Iodo-1-methyl-propyl)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yloxy]-tetrahydro-pyran