Lythraceous alkaloids. Part VI. The structures of lythrancine-I, -II, -III, and -IV and lythrancepine-I, -II, and -III

Abstract

Chemical and spectroscopic investigation of seven new Lythrum alkaloids led to elucidation of their structures. All were shown to have a common basic structure of 4-(biphenyl-3-yl)perhydroquinolizine with a butane bridge between the 3′-position of the biphenyl group and the 6-position of the quinolizine nucleus. Lythrancine-I, -II, -III, and -IV and lythrancepine-I, -II, and -III are represented by formulae (XIV)–(XX), respectively.