脱氧强的松龙-16-烯 、
N-(furan-3-ylmethyl)hydroxylamine 在
三聚甲醛 作用下,
以
乙醇 为溶剂,
以42%的产率得到(4aR,4bS,5S,6aS,6bR,9aS,10aS,10bS)-8-(5-bromo-furan-2-ylmethyl)-5-hydroxy-6b-(2-hydroxy-acetyl)-4a,6a-dimethyl-4a,4b,5,6,6a,6b,8,9,9a,10,10a,10b,11,12-tetradecahydro-7-oxa-8-aza-pentaleno[2,1-a]phenanthren-2-one