J. Lehmann et al., INDOLES XIII(1) - SYNTHESES AND STEREOCHEMISTRY OF 14H-BISINDOLO[2,3-A][3,2-H]QUINOLIZINE AND OF SOME BENZ[A]-INDOLO[3,2-H]QUINOLIZINES, Heterocycles, 41(1), 1995, pp. 119-130
Starting from hexahydrobenz[a]indolo[3,2-h]quinolizine (1a-c) and hexa
hydrobisindolo[2,3-a][3,2-h]quinolizine (4)(2) we succeeded in generat
ing their completely dehydrogenated derivatives. The structures were i
nvestigated by H-1- and C-13-nmr spectroscopy as well as by X-ray anal
ysis.