The steroidal alkaloid 3β, 20α-diamino-pregn-5-ene (kurchamine) obtained from the stem bark of Holarrhena antidysenterica is reported to have appreciable amoebicidal activity. Its three stereoisomers namely 3α, 20β-diamino-pregn-5-ene, 3β, 20β-diamino-pregn-5-ene and 3α,20α-diamino-pregn-5-ene and their intermediate stereoisomeric monoamino pregnene alkaloids namely 3β-amino-pregn-5-ene-20-one, 3α-amino-pregn-5-ene-20-one, 20α -amino-pregn-5-ene-3β-ol, 20β-amino-pregn-5-ene-3β-ol were synthesized. The natural stereoisomer and synthesized diamino and monoamino stereoisomers were N-methylated and all the compounds were evaluated for amoebicidal activity comparison. The natural stereoisomer 3β,20α-diamino-pregn-5-ene (kurchamine) was found to be superior than other stereoisomers and N-methylation was found to have insignificant effect on amoebicidal activity of stereoisomers.
从印度白花木(Holarrhena antidysenterica)的树皮中获得的类
固醇生物碱3β, 20α-二
氨基孕-5-烯(库尔喹明)据报道具有显著的阿米
巴杀灭活性。其三种立体异构体,分别为3α, 20β-二
氨基孕-5-烯、3β, 20β-二
氨基孕-5-烯和3α, 20α-二
氨基孕-5-烯,以及它们的中间立体异构体单
氨基孕烯
生物碱,包括3β-
氨基孕-5-烯-20-酮、3α-
氨基孕-5-烯-20-酮、20α-
氨基孕-5-烯-3β-醇、20β-
氨基孕-5-烯-3β-醇均已合成。天然立体异构体和合成的二
氨基及单
氨基立体异构体均进行了N-甲基化处理,并对所有化合物的阿米
巴杀灭活性进行了比较评估。结果发现,天然立体异构体3β, 20α-二
氨基孕-5-烯(库尔喹明)优于其他立体异构体,而N-甲基化对立体异构体的阿米
巴杀灭活性影响不显著。