single and dual reductiveamination followed by N-methylation of aldehydes and ketones to synthesize N,N-dimethyl as well as N-methyl tertiary amines, respectively, utilizing ammonium formate and methanol as N1 and C1 sources is reported. The protocol was efficiently extended to a tandem reductiveamination/N-methylation/cyclization of keto acids/esters leading to N-methyl lactams. A broad substrate