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A simple arylamine-catalyzed Mannich-cyclization cascade reaction was developed for facile synthesis of substituted 2 H -benzo[ h ]chromenes. The notable feature of the process included the efficient generation of ortho -quinone methides ( o -QMs) catalyzed by a simple aniline. The mild reaction conditions allowed for a broad spectrum of 1- and 2-naphthols and trans -cinnamaldehydes to engage in the cascade sequence with high efficiency.

Facile Synthesis of 2H-Benzo[h]Chromenes via an Arylamine-Catalyzed Mannich Cyclization Cascade Reaction