... The reactions proceed via imine VII or iminium VIII compounds as common intermediates. J. Heterocyclic Chem., 23, 1701 (1986). Acylamidomethylation [4,5] is a well-known and valu- able electrophilic aromatic substitution. ... 6.44 6.60 6.44 6.44 Vol. 23 Calcd. ...