Synthesis of Pyrrolo- and Pyrido-[1,2-<i>a</i>]benzimidazolequinone Anti-tumor Agents Containing a Fused Cyclopropane Ring
作者:Fawaz Aldabbagh、John O’Shaughnessy
DOI:10.1055/s-2005-861832
日期:——
A cyclopropanering 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