Formation of the 5-Azoniafulvene Ion and its Benzo-annellated Analogue from N-<i>Mannich</i>Bases of Pyrrole and Indole
作者:Ulrich Burger、Alain O. Bringhen、Philippe J. Wirthner、Jean-Claude Schärer
DOI:10.1002/hlca.19850680822
日期:1985.12.18
N-atom rather than at the pyrrole ring. Spontaneous cleavage of the resulting quaternary acylammonium salts affords the 5-azoniafulvene ion (3). This higly reactive iminium ion, and its benzo-annellated analogue (4) can be trapped by electron rich aromatic compounds such as N-methylpyrrole or N,N-dimethylaniline. More elaborate N-Mannich bases are accessible by addition of indoles to enamines.