4-Chlorophenyl Isocyanate → N-(4-chlorophenyl)-N'-(2-(4-(5-methyl-3-oxo-1H-imidazo[1,5-c]imidazol-2(3H)-yl)-1-piperidinyl)-2-oxo-1-phenylethyl)urea

Participants

Reaction Steps

2-(1-(2-Amino-2-phenylacetyl)-4-piperidinyl)-5-methyl-1,2-dihydro-3H-imidazo[1,5-c]imidazol-3-one (0.10 g) obtained in Example 50b) was dissolved in DMF (3.0 ml), 4-chlorophenyl isocyanate (0.05 g) was added thereto, and mixed at room temperature for 1 hour. The reaction mixture was dissolved in ethyl acetate, washed with an aqueous sodium hydrogen carbonate solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified with basic silica gel column (ethyl acetate to methanol/ethyl acetate=1/10). The product was crystallized from ethyl acetate-diethyl ether to obtain the title compound as colorless powder (0.09 g, 59%).

Provenance & Evidence