S. Padmanabhan et al., A CONVENIENT ONE-POT PROCEDURE FOR N-METHYLATION OF AROMATIC-AMINES USING TRIMETHYL ORTHOFORMATE, Synthetic communications, 27(4), 1997, pp. 691-699
Aromatic amines react with trimethyl orthoformate in the presence of c
oncentrated sulfuric acid followed by acid hydrolysis to afford mono m
ethylated amines in moderate to good yields.