Triethylamine → 4-[2-(4-tert-Butoxycarbonyl-piperazine-1-carbonyl)-4-cyano-phenyl]-3,6-dimethyl-2-oxo-1-(3-trifluoromethyl-phenyl)-1,2,3,4-tetrahydro-pyrimidine-5-carboxylic acid ethyl ester

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Reaction Steps

4-(2-carboxy-4-cyano-phenyl)-3,6-dimethyl-2-oxo-1-(3-trifluoromethyl-phenyl)-1,2,3,4-tetrahydro-pyrimidine-5-carboxylic acid ethyl ester (intermediate 10)(30.0 mg, 0.06 mmol) is suspended in N,N-dimethylformamide (0.5 mL) and triethylamine (20.0 μL, 0.14 mmol) is added. The mixture is stirred at room temperature for 5 min and O-(7-azabonzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium-hexafluorophosphate (24.6 mg, 0.065 mmol) is added and the mixture is stirred for 15 min. A solution of tert-butyl 1-piperazinecaboxylate (17.2 mg, 0.09 mmol) in N,N-dimethylformamide (0.5 mL) and triethylamine (20.0 μL, 0.14 mmol) is added and the reaction mixture stirred at room temperature for 2 h. The crude product is purified by reversed phase HPLC. ESI mass spectrum [M-tBu+H]+=600; Retention time HPLC: 1.21 min (HPLC method Z018_S08).

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