tert-Butyl 4-({[(3-isopropyl-2-oxo-2,3-dihydro-1H-benzimidazol-1-yl)carbonyl]amino}methyl)piperidine-1-carboxylate → 3-isopropyl-2-oxo-N-(piperidin-4-ylmethyl)-2,3-dihydro-1H-benzimidazole-1-carboxamide

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Reaction Steps

A solution of tert-butyl 4-({[(3-isopropyl-2-oxo-2,3-dihydro-1H-benzimidazol-1-yl)carbonyl]amino}methyl)piperidine-1-carboxylate (3.992 g, 9.58 mmol) in 50 ml 10% hydrochloric acid in methanol and 10 ml concentrated hydrochloric acid was stirred at room temperature for 18 hours. The mixture was then concentrated and basified with aqueous Na2CO3, extracted with CHCl3 (100 ml) for 3 times. The combined extract was dried and concentrated. Flash chromatography of the residue (NH-silica gel, elutent: CH2Cl2/methanol=100/1) afforded a colorless oil 2.272 g (75%) as the title compound.

Provenance & Evidence