Ethyl 5-amino-1-phenyl-1H-1,2,3-triazole-4-carboxylate → 5-(4-Bromo-phenyl)-6-(4-chloro-phenyl)-3-phenyl-3,6-dihydro-[1,2,3]triazolo[4,5-d]pyrimidin-7-one

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A mixture of 5-amino-1-phenyl-1H-[1,2,3]triazole-4-carboxylic acid ethyl ester (30 mg, 0.33 mmol), 4-bromo-N-(4-chloro-phenyl)-benzimidoyl chloride (51 mg, 0.16 mmol) and TiCl4 (20 μL) in anhydrous dichloroethane (1 mL) is heated in microwave reactor at 170° C. for 1 h and then at 115° C. for 48 h in an oil bath. After cooling down to room temperature, the mixture is worked up as in example 2 and purified by flash column chromatography (silica gel, 0˜30% EtOAc/hexane) to provide the title compound 5-(4-Bromo-phenyl)-6-(4-chloro-phenyl)-3-phenyl-3,6-dihydro-[1,2,3]triazolo[4,5-d]pyrimidin-7-one as white solid. (45 mg, 73%). 1H NMR (CDCl3) δ (ppm) 8.15(d, 2H), 7.59(t, 2H), 7.49(t, 1H), 7.43 (d, 2H), 7.37(d, 2H), 7.21(d, 2H), 7.10(d, 2H), 2.87(m, 1H). HPLC-MS calculated C22H13BrClN5O (M+1+): 478.0. Found: 478.0.

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