H. A. A. El-Nabi
May 1, 2004
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Journal
Journal of Chemical Research
Abstract
Pyrazolo[3,4-d]pyrrolo[2,3-b]pyridine derivatives (6a–f) were obtained by oxidation of tosylhydrazones of 2-allylamino-5-methoxypyrrole-3-carbaldehydes (3a–f) with lead tetraacetate. The nitrilimine intermediates (5a–f) underwent intramolecular 1,3-dipolar cycloaddition to yield the tricyclic heterocycles 6a–f in good yields.