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A variety of 2-amino-3-cyano-5-oxo-4-perfluoroalkyl-5,6,7,8-tetrahydro-4H-chromene derivatives were achieved via a one-pot, three-component reaction from easily available methyl 2-perfluoroalkynoate, malononitrile (or ethyl cyanoacetate), and diverse cyclic 1,3-diketones. Moderate to good yields (up to 93%) were obtained in the presence of catalytic methylamine. This process went through a tandem...
Et 3 N-catalyzed reactions of salicyl N-tosylimines or salicylaldehydes with methyl 2-perfluoroalkynoates proceed smoothly at room temperature in dichloromethane (DCM) or dimethyl sulfoxide (DMSO) to give the corresponding fluorinated chromenes in good to excellent yields with high regioselectivity.
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