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Synthesis 2005(7): 1069-1076
DOI: 10.1055/s-2005-861832
DOI: 10.1055/s-2005-861832
PAPER
© Georg Thieme Verlag Stuttgart · New York
Synthesis of Pyrrolo- and Pyrido-[1,2-a]benzimidazolequinone Anti-tumor Agents Containing a Fused Cyclopropane Ring
Further Information
Publication History
Received
6 December 2004
Publication Date:
21 February 2005 (online)


Abstract
A cyclopropane ring has been fused onto tetrahydropyrrolo- and tetrahydropyrido-[1,2-a]-benzimidazoles and -benzimidazolequinones via the cycloaddition of diazomethines generated from the thermolysis of N-(allyl and but-3-enyl)benzimidazole-2-Eschenmoser hydrazones (aziridinyl imines). At lower temperatures, the 1,3-dipolar [3 + 2] cycloadduct was obtained for only the N-allylbenzimidazole-2-Eschenmoser hydrazones.
Key words
benzimidazoles - bioreductive - diazo-compounds - heterocycles - hydrazones