Sa. Petrich et al., THE APPLICATION OF VINYLOGOUS IMINIUM SALTS AND RELATED SYNTHONS TO THE PREPARATION OF TRISUBSTITUTED PYRIDINES, Tetrahedron, 51(6), 1995, pp. 1575-1584
The reaction of unsymmetrical vinylogous iminum salts and related anal
ogs with beta-aminocrotononitrile to yield 2,3,6-trisubstituted pyridi
nes with regioselective control is described.