Isolation of Four 2,3,5,6,11,11b-Hexahydro-3-oxo-1<i>H</i>-indolizino[8,7-<i>b</i>]indole-5-carboxylic Acids from<i>Clerodendron Trichotomum</i>Thunb and Properties of Their Derivatives
作者:Hajime Irikawa、Yasuhiro Toyoda、Hiroaki Kumagai、Yasuaki Okumura
DOI:10.1246/bcsj.62.880
日期:1989.3
precursors of trichotomine, were isolated as the methyl esters from Clerodendron trichotomum Thunb, and the structures elucidated on the basis of their spectral and chemical evidences. The existence of two pairs of the C-11b epimers in the above plant were supported by the methoxide-catalyzed equilibrations of the compounds having the substituent on C-11b. Blue pigments were formed from the isolated
四种 2,3,5,6,11,11b-hexahydro-3-oxo-1H-indolizino[8,7-b]indole-5-羧酸,trichotomine 的合理前体,被分离为来自 Clerodendron trichotomum 的甲酯Thunb 和根据光谱和化学证据阐明的结构。上述植物中两对 C-11b 差向异构体的存在得到了在 C-11b 上具有取代基的化合物的甲醇盐催化平衡的支持。蓝色颜料由分离的化合物形成。