H. Irikawa, Yasuhiro Toyoda, Hiroaki Kumagai
Mar 1, 1989
Citations
0
Influential Citations
20
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
Four 2,3,5,6,11,11b-hexahydro-3-oxo-1H-indolizino[8,7-b]indole-5-carboxylic acids, plausible 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 compounds.