Studies on the alkaloids from Picrasma quassioides BENNET. V. Structures of picrasidines L,M, and P.
作者:TAICHI OHMOTO、KAZUO KOIKE
DOI:10.1248/cpb.33.3847
日期:——
Two new alkaloids, picrasidines M (II) and P (III), have been isolated from the root-bark of Picrasma quassioides BENNET. The structure of picrasidine L has been revised from 3-methyl-canthin-2, 6-dione to 3-methylcanthin-5, 6-dione (I). The structures were determined on the basis of spectral analysis and chemical evidence.
Three new β-carboline alkaloids, picrasidines I (I), J (II), and K (III), were isolated from the bark of Picrasma quassioides BENNET. The structures were determined on the basis of spectral analyses and chemical transformations.
Picrasidine-U, dimeric alkaloid from Picrasma quassioides
作者:Kazuo Koike、Taichi Ohmoto
DOI:10.1016/0031-9422(88)80725-8
日期:1988.1
Abstract A new canthin-5,6-dione and β-carboline dimericalkaloid, picrasidine-U was isolated from the root wood of Picrasmaquassioides. The structure was determined by spectral analysis and chemical evidence.