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The first synthesis to construct coumarin-fused pyrido[2,3-b]porphyrins has been accomplished via a cascade reaction of 2-amino-meso-tetraphenylporphyrins, aromatic aldehydes and 4-hydroxycoumarin in o-dichlorobenzene containing a stoichiometric amount of trichloroacetic acid under reflux conditions. The methodology presented herein provides a direct access to a new series of π-extended nickel(ii) and copper(ii) porphyrin analogues in 58-69% isolated yields under one-pot operation. Furthermore, coumarin-fused copper(ii) pyrido[2,3-b]por