Synthese de pyridines par cyclisation de systemes azatrieniques
作者:G. Dauphin、B. Jamilloux、A. Kergomard、D. Planat
DOI:10.1016/0040-4020(77)80403-1
日期:——
The cyclisation of imines from α,β-unsaturated aldehydes and allylamine to pyridines has been studied. At 25°, the catalytic action of the basic system sodium-alloocimene gives a first type of cyclisation binding the α carbon of the amino chain to the δ carbon of the aldehydic one. Arguments in favour of a carbanionic cyclisation are advanced. A second type of cyclisation is observed in the case of