A simple, efficient, and general methods has been d eveloped for the One-pot three-component reaction o f salicylaldehyde 1,3-dicarbonyl compounds and 2-Amin obenzimidazole in the presence of catalytic amounts of piperidine in acetic acid led to a chemo selective synthesis of chromeno[4,3-d]pyrimidine-6-one deriv atives, in good yields.
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