N-(苄羰氧基)羟基胺 、
(S)-1-((E)-Buta-1,3-dienyl)-5-oxo-pyrrolidine-2-carboxylic acid (3S,8S,9S,10R,13R,14S,17R)-17-((R)-1,5-dimethyl-hexyl)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl ester 在
tetrapropylammonium periodate 、 4 A molecular sieve 作用下,
以
二氯甲烷 为溶剂,
以10%的产率得到benzyl (6R)-6-[(2S)-2-[[(3S,8S,9S,10R,13R,14S,17R)-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl]oxycarbonyl]-5-oxopyrrolidin-1-yl]-3,6-dihydrooxazine-2-carboxylate