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Abstract | Cited by

A new BF3·OEt2-catalyzed approach was developed for the construction of 2,2′-spirobi-2H-1-benzopyrancarboxylates by reacting ethyl 2-(chloromethyl)-2-hydroxy-2H-chromene-3-carboxylates with salicylaldehydes. The reactions proceeded through the formation of C–C and C–O bonds in one pot. Structure assignment of compound 3c was confirmed by single crystal X-ray analysis.

Graphical abstract: BF3·OEt2-catalyzed synthesis of 2,2′-spirobi-2H-1-benzopyrans from 2H-chromenes

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