(S)-2-{[(3S,4R,5R,8S,9S,10R,13S,14S,17S)-17-((S)-1-Dimethylamino-ethyl)-4-hydroxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-3-ylamino]-methyl}-3-methyl-butyric acid methyl ester 在
lithium aluminium tetrahydride 作用下,
以
乙醚 为溶剂,
生成
20α-Dimethylamino-4β-hydroxy-3β-<2-hydroxymethyl-3-methylbutylamino>-5α-pregnan