Y. Asada, T. Furuya
Feb 25, 1984
Citations
0
Influential Citations
22
Citations
Journal
Chemical & Pharmaceutical Bulletin
Abstract
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.