Two new pregnane alkaloids, wrightiamines A (1) and B (2), were isolated from the extract of the tropical Apocynaceous plant Wrightia javanica collected in Thailand, and their structures were elucidated by spectral data. Wrightiamine B (2) was preparaed from 3β-hydroxy-5α-pregnan-20-one to establish the configuration of the C-20 position as S. Wrightiamine A (1) exhibited cytotoxic activity against vincristine-resistant murine leukemia P388 cells.
从泰国采集的热带
茜草植物 Wrightia javanica 的
提取物中分离出了两种新的孕烷
生物碱,即 Wrightiamine A (1) 和 B (2),并通过光谱数据阐明了它们的结构。从 3β-hydroxy-5α-pregnan-20-one 中制备出了 Wrightiamine B (2),确定了 C-20 位的构型为 S。Wrightiamine A (1) 对耐
长春新碱的小鼠白血病 P388 细胞具有细胞毒活性。