FUSED QUINOLINE HETEROCYCLES. II. FIRST SYNTHESIS OF 1,2,3,4,5,6-HEXAAZAACEANTHRYLENES AND 5,7,8,10a,11-PENTAAZABENZO[a]-FLUORENES

Abstract

The new tetracyclic ring systems 5-alkyl-1,5-dihydro-1,2,3,4,5,6-hexaazaaceanthrylenes 5a–d were synthesized by diazotization of 4-alkylamino-3-amino-1H-pyrazolo[4,3-c]quinolines 4a–d. The 4-arylamino-3-diazo-1H-pyrazolo-[4,3-c]- quinolines 6e–h, which were prepared by diazotisation of the corresponding amines 4e–h, readily formed the novel tetracyclic ring system ethyl 6-arylamino-10-methyl-5,7,8,10a,11-pentaazabenzo[a]fluorene-9-carboxylates 8e–h, when treated with ethyl acetoacetate.

Acknowledgments