J. Lehuede et al., PREPARATION OF 1H-2,3,4,5-TETRAARYLPYRROLES BY OXIDATION OF HETEROCYCLIC IMINE-ENAMINES, Synthetic communications, 26(4), 1996, pp. 793-802
Heterocyclic imine-enamines 1 were prepared from metalated methyl subs
tituted heterocycles and aromatic nitriles and then oxidized with lead
tetracetate to give various tetraarylpyrroles 2.