Trifluoro-acetic acid (R)-5-((1S,3R,5S,6S,7S,8S,9S,10R,13R,14S,17R)-1,3-diacetoxy-6,7-dibromo-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-17-yl)-1,1-dimethyl-hexyl ester 在
N,N-diethyl-N-methylethanaminium dimethyl phosphate 作用下,
以
六甲基磷酰三胺 为溶剂,
生成 1α,3β-Diacetoxy-25-hydroxycholesta-Δ
5,7-dien