Hydrochloric Acid → 5-methyl-2-(4-piperidinyl)methyl-1,2-dihydro-3H-imidazo[1,5-c]imidazol-3-one dihydrochloride

Participants

Reaction Steps

To tert-butyl 4-((5-methyl-3-oxo-1H-imidazo[1,5-c]imidazol-2(3H)-yl)methyl)-1-piperidinecarboxylate (3.5 g) obtained in Example 85a) was added concentrated hydrochloric acid (10 ml), and mixed for 10 minutes. To the reaction mixture was added ethanol, and the solvent was distilled off under reduced pressure. To the residue was further added ethanol, and the solvent was distilled off under reduced pressure. To the residue was added isopropyl alcohol, and the precipitate was collected by filtration. The precipitate was washed sequentially with isopropyl alcohol and diethyl ether and dried under reduced pressure to obtain 5-methyl-2-(4-piperidinyl)methyl-1,2-dihydro-3H-imidazo[1,5-c]imidazol-3-one dihydrochloride as a colorless solid (2.5 g, 78%).

Provenance & Evidence