Studies on constituents of crude drugs. XV. New pyrrolizidine alkaloids from Ligularia dentata.
作者:YOSHIHISA ASADA、TSUTOMU FURUYA
DOI:10.1248/cpb.32.475
日期:——
Four new pyrrolizidine alkaloids, ligularidine, neoligularidine, ligularizine and ligularinine, were isolated together with the known compound clivorine from the roots and aerial parts of Ligularia dentata. Their structures were elucidated on the basis of the spectral data and chemical conversion of clivorine into these alkaloids. A useful epoxidation of pyrrolizidine alkaloids was achieved by using performic acid.
从带齿苦苣根部和地上部分分离出四种新的吡咯里啶生物碱,分别为 ligularidine、neoligularidine、ligularizine 和 ligularinine,同时还分离出了已知化合物 clivorine。根据光谱数据和将 clivorine 转化为这些生物碱的化学反应,阐明了它们的结构。通过使用过甲酸,成功实现了吡咯里啶生物碱的有效环氧化。