Ammonium formate → (S)-4-[2-Hydroxy-3-(N,N-dibenzylamino)propoxy]-1,3-dihydro-2H-benzimidazol-2-one

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Reaction Steps

4-[2-Hydroxy-3-(N,N dibenzylamino)propoxy]-1,3-dihydro-2H-benzimidazol-2-one (4.35 g, 10.8 mmol) was dissolved in methanol (200 mL) and treated with a vast excess of ammonium formate (13.0 g, 0.21 mol), followed by 10% palladium on carbon (1.5 g). The suspension was stirred at reflux for 3 hours. After cooling the suspension, the reaction mixture was filtered through Celite. The filtrate concentrated in vacuo to a pale brown oil which slowly crystallized upon standing. The resulting solid was triturated using chloroform containing methanol and filtered to give 1.56 g (65%) as the desired product of a pale grey solid. NMR. MS.

Provenance & Evidence