This research seeks to combine the reducing ability of N,N-disubstituted formamides with the ability of subcritical water to facilitate organic reactions to synthesize tertiary amines. A one-pot, direct reductive amination of aldehydes to form long-chain, tertiary amines was investigated at various temperatures, reaction times, and reagent equivalencies. The formamides act as both the nitrogen source and reducing agent when combined with subcritical water to provide a green route to tertiary amines without additional metal or Lewis acid catalysts.