雄酮 、
N-[diphenyl-[(2R,3R,4S,5R,6R)-3,4,5-tris(phenylmethoxy)-6-(phenylmethoxymethyl)oxan-2-yl]oxy-lambda5-phosphanylidene]-4-methylbenzenesulfonamide 在
4 A molecular sieve 、
三氟化硼乙醚 作用下,
以
二氯甲烷 为溶剂,
反应 6.0h,
以72%的产率得到(3R,5S,8R,9S,10S,13S,14S)-10,13-dimethyl-3-[(3R,4S,5R,6R)-3,4,5-tris(phenylmethoxy)-6-(phenylmethoxymethyl)oxan-2-yl]oxy-1,2,3,4,5,6,7,8,9,11,12,14,15,16-tetradecahydrocyclopenta[a]phenanthren-17-one