Synthesis 2008(16): 2527-2536  
DOI: 10.1055/s-2008-1067186
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

Fast and Efficient Synthesis of Pyrano[3,2-c]quinolines Catalyzed by Niobium(V) Chloride

Luiz Carlos da Silva-Filhoa,b, Valdemar Lacerda Júniora,c, Mauricio Gomes Constantino*a, Gil Valdo José da Silvaa
a Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes 3900, 14040-901 Ribeirão Preto, SP, Brazil
Fax: +55(16)36338151; e-Mail: mgconsta@usp.br;
b Centro de Estudos de Insetos Sociais, Instituto de Biociências, Universidade Estadual Paulista, Av. 24A, nº 1515, 13506-900 Rio Claro, SP, Brazil
c Departamento de Química, Centro de Ciências Exatas, Universidade Federal do Espirito Santo, Av. Fernando Ferrari 514, 29060-900 Vitória, ES, Brazil
Further Information

Publication History

Received 10 March 2008
Publication Date:
24 July 2008 (online)

Abstract

A highly efficient two-step method for the synthesis of pyranoquinoline derivatives from imino-Diels-Alder reactions between aldimines and 3,4-dihydro-2H-pyran using niobium(V) chloride as catalyst under mild conditions is described.