Synthesis of a Novel Hexa Cyclic Benzimidazo[1,2-c]indazolo-[2,3-a]quinazoline

Two alternate synthetic routes are described for the synthesis of the hitherto unknown benzimidazo[1,2-c]indazolo[2,3-a]quinazoline (3). While dehydrative cyclisation of 2-[2-(2-azidobenzoylamino)-phenyl]benzimidazole (2) in polyphosphate ester gave 3 in low yield, very good yields were obtained in...

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Veröffentlicht in:Synthetic communications 1991-01, Vol.21 (1), p.49-61
Hauptverfasser: Reddy, V. Rama Kishan, Reddy, S. N., Ratnam, C. V.
Format: Artikel
Sprache:eng
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Zusammenfassung:Two alternate synthetic routes are described for the synthesis of the hitherto unknown benzimidazo[1,2-c]indazolo[2,3-a]quinazoline (3). While dehydrative cyclisation of 2-[2-(2-azidobenzoylamino)-phenyl]benzimidazole (2) in polyphosphate ester gave 3 in low yield, very good yields were obtained in triethyl phosphite reductive cyclisation of 6-(2-nitrophenyl)benzimidazo[1,2-c]quinazolines (8).
ISSN:0039-7911
1532-2432
DOI:10.1080/00397919108020789