Ethyl Acetate → 2-(1-(2-amino-2-phenylacetyl)-4-piperidinyl)-5-methyl-1,2-dihydro-3H-imidazo[1,5-c]imidazol-3-one

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Reaction Steps

tert-Butyl 2-(4-(5-methyl-3-oxo-1H-imidazo[1,5-c]imidazol-2(3H)-yl)-1-piperidinyl)-2-oxo-1-phenylethylcarbamate (0.43 g) obtained in Example 50a) was dissolved in concentrated hydrochloric acid (1.5 ml), and mixed at room temperature for 5 minutes. Ethyl acetate was added thereto, and the reaction mixture was washed with an aqueous sodium hydrogen carbonate solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to obtain the title compound as colorless powder (0.10 g, 31%).

Provenance & Evidence