M. Bencková, A. Krutošíková
Oct 17, 1995
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ChemInform
Abstract
The synthesis of pyrrolo[2′,3′:4,5]furo[3,2-c]pyridines (6a–6d) is described. Substituted pyridones (4a–4d) were prepared by thermic cyclization of the corresponding acyl azides (3a–3d), available from substituted propenoic acids (2a–2d)via a one pot reaction with ethyl chloroformate and sodium azide. Upon treatment with phosphorus oxychloride the pyridones (4a–4d) gave substituted chloropyridines (5a–5d) which were reduced with zinc in acetic acid to yield the title compounds (6a–6d).