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We report the eco-friendly synthesis of fused pyrano[2,3- b ]pyrans  via  ammonium acetate-mediated formal oxa-[3 + 3]-cycloaddition of 4 H -chromene-3-carbaldehydes and cyclic 1,3-dicarbonyl compounds.

rsc advances

Eco-friendly synthesis of fused pyrano[2,3-b]pyrans via ammonium acetate-mediated formal oxa-[3 + 3]cycloaddition of 4H-chromene-3-carbaldehydes and cyclic 1,3-dicarbonyl compounds