Fast and efficient synthesis of pyrano[3,2-c]quinolines catalyzed by niobium(V) chloride.

[摘要]：A highly efficient 2-step method for the synthesis of pyranoquinoline derivs. from imino-Diels-Alder reactions between aldimines and 3,4-dihydro-2H-pyran using NbCl5 as catalyst under mild conditions is described.

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