在
甲醇 、
三苯基膦 作用下,
以46%的产率得到methyl (4R)-4-[(3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-3-[[(4R)-4-[(3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-3-[[(2S)-2-[[(4R)-4-[(3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-3-amino-7,12-dihydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoyl]amino]-5-(phenylmethoxycarbonylamino)pentanoyl]amino]-7,12-dihydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoyl]amino]-7,12-dihydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoate