Flavone-Nitrogen Heterocycle Conjugate Formation by 1,3-Dipolar Cycloadditions
作者:Regina M. S. Sousa、Diana C. G. A. Pinto、Artur M. S. Silva、Vanda Vaz Serra、Ana I. R. N. A. Barros、Maria A. F. Faustino、Maria G. P. M. S. Neves、José A. S. Cavaleiro
DOI:10.1002/ejoc.201101185
日期:2012.1
Azomethine ylides generated in situ from the reaction of N-[2-, 3- and 4-(chromon-2-yl)phenyl]glycine and paraformaldehyde can be trapped with dipolarophiles in 1,3-dipolarcycloaddition reactions to yield flavone–nitrogenheterocycle dyads. These azomethine ylides proved to be reactive with electron-poor dipolarophiles, affording the expected adducts. The use of microwave irradiation as an alternative