Eschweiler-Clarke reductive alkylation

Amine synthesis from reductive amination of a ketone and an amine in the presence of excess formic acid, which serves as the reducing reagent by delivering a hydride. When the ketone is replaced by formaldehyde, it becomes Eschweiler-Clarke reductive alkylation of amines. 

Brewer, A. R. E. Eschweiler-Clarke reductive alkylation of amine. In Name Reactions for Functional Group Transformations-, Li, J. J., Corey, E. J., eds. John Wiley Sons Hoboken, NJ, 2007, pp 86-111. (Review). 

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