An Efficient One-Pot Synthesis of Substituted 1H-Naphtho[2,1-b]pyrans and 4H-1-Benzopyrans (=Chromenes) under Solvent-Free Microwave-Irradiation Conditions

[摘要]：A facile heterogeneous synthesis of 3-amino-1-aryl-1H-naphtho[2,1-b]pyran and 2-amino-4-aryl-4H-1-benzopyran derivatives 3 and 5, respectively, was carried out efficiently by one-pot three-component coupling of an aromatic aldehyde 1, an active methylene compound 2, and naphthalen-2-ol or a phenol 4 in the presence of 5-angstrom molecular sieves under solvent-free microwave-irradiation conditions (Scheme 1 and 2, Tables 1 and 2). The catalyst was recovered and recycled (Table 3).

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