Benzo- and Indoloquinolizine Derivatives II. Synthesis of 10, 11-Dihydrotribenzo[a, c, h]15bH-Quinolizine

Abstract
We wish to report the synthesis of 10,11-dihydrotribenzo[a, c, h]15bH-quinolizine (4) by photocyclisation of a mixture of 1, 2-diphenyl-3,4-dihydroisoquinoliniumperchlorate (2) and 1,2-diphenylisoquinoliniumperchlorate (3), followed by a sodiumborohydride reduction (Scheme).