New dibenz[d,f]azonine alkaloids from Cocculus laurifolius DC
Abstract
The structures of laurifonine (17)(6,7,8,9-tetrahydro-2,3,12-trimethoxy-7-methyl-5H-dibenz[d,f]azonine) laurifine (18)(its 7-demethyl analogue), and laurifinine (19)(its 2-de-O-methyl analogue) have been established by chemical and spectroscopic studies. The biogenesis of dibenz[d,f]azonine bases is discussed.