Pnh. Nizar et al., A CONVENIENT SYNTHESIS OF N-METHYLATED 1,2,3,4-TETRAHYDRO-1-AZANAPHTHACENES, Indian Journal of Heterocyclic Chemistry, 5(2), 1995, pp. 107-110
The aluminium chloride/phthaloyl chloride in nitrobenzene is more suit
able medium than aluminium chloride melt for the synthesis of N-methyl
ated 1,2,3,4-tetrahydro-1-azanaphthacenes by the cyclocondensation of
corresponding N-methylated 1,2,3,4-tetrahydro quinolines.