Yijun Duan, Xu Wang, Xiao-ling Xu
Jun 13, 2013
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Synthesis
Abstract
A series of ethyl 4-(het)aryl-5,10-dioxo-2-hydroxy-2-(trifluoromethyl)-3,4,5,10-tetrahydro-2 H -benzo[ g ]chromene-3-carboxylates were efficiently synthesized from 2-hydroxynaphthoquinone, aromatic aldehydes, and ethyl 4,4,4-trifluoro-3-oxobutanoate by a one-pot multicomponent reaction catalyzed by the combination of ammonium acetate and acetic acid. The benzochromenes are presumably formed through an initial Knoevenagel condensation followed by a Michael addition and regioselective intramolecular annulation. The dehydration reaction of the hemiketal moiety to the corresponding dehydrated product was also studied.