Fused pyridine derivatives R 0450 Fast and Efficient Synthesis of Pyrano[3,2-c]quinolines Catalyzed by Niobium(V) Chloride. -NbCl 5 is used as catalyst for the imino-Diels-Alder reaction between aldimines and 3,4-dihydro-2H-pyran to give diastereomeric mixtures of fused pyrano[3,2-c]quinolines. Remarkably, NbCl5 exhibits a higher efficiency compared to other Lewis acid catalysts. -(DA SILVA-FILHO, L. C.; LACERDA, V. J.; GOMES CONSTANTINO*, M.; DA SILVA, G. V. J.; Synthesis 2008, 16, 2527-2536; Dep. Quim., Fac. Filos. Cienc. Let., Univ. Sao Paulo, 14040 Ribeirao Preto, Sao Paulo, Brazil; Eng.) -Mais 52-159
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