Abstract
Three-component coupling reactions of aldehydes, amines, and cyclic enol ethers have been carried out in the presence of samarium triflate to afford the corresponding pyrano and furanoquinolines in excellent yields with high endo-selectivity. The reaction conditions are mild and amenable to scale-up.
ACKNOWLEDGMENT
A. R. R. thanks the University Grants Commission, New Delhi, for the award of a fellowship.
Notes
a All products were characterized by 1H NMR, IR, and mass spectra.
b Isolated and unoptimized yields.
c cis/trans isomers were separated by column chromatography.