THERMAL DECOMPOSITION OF N-ALKYLATED-2-AMINO-BENZOPHENONES

摘要

Thermal decomposition of N-alkylated 2-aminobenzophenones 1a-d was studied at 400-560 °C, using calcium oxide as catalyst. The reactions yielded both 5- and 6-membered heterocyclic compounds. The N-methylated-2-aminobenzophenones 1a-b decomposed at 400-560 °C to give 2-phenylindole 2 (47% at 500 °C from 1b), acridine 4 and phenanthridine 5, while the N-benzylated-2-aminoberizophenones 1c-d decomposed at 400-560 °C to give 2,3-diphenylindole 3 (33% at 450 °C and 400 °C from 1c and 1d, respectively), acridine 4 and phenanthridine 5.