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A facile entry to 3-substituted imidazo[1,2- a ]pyridines from halides and 2-amino pyridines  via  formimidamide chemistry has been developed through a formal anti-Baldwin 5-endo-trig cyclization that becomes a thermally allowed 5-exo-trig cyclization.

Facile synthesis of 3-substituted imidazo[1,2-a]pyridines through formimidamide chemistry