A Rapid Synthesis of Thieno[2,3-c]pyridine and 2-Substituted Thieno[2,3-c]pyridines

Abstract

A convenient preparation of thieno[2,3-c]pyridine 3a and of several original 2-substituted-thieno[2,3-c]pyridines 3b-f is achieved by cyclization of the Schiff base resulting from the condensation between a 2-thiophenecarboxaldehyde 1a-f and aminoacetaldehyde dimethyl acetal. This procedure provides especially good yields in the case of 2-halogenated analogues.

Keywords

cyclizations - electrophilic aromatic substitutions - heterocycles - Schiff bases - thienopyridine

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