Ethyl 5-amino-3-(methylthio)-1-phenyl-1H-pyrazole-4-carboxylate → 5-(4-Chloro-phenyl)-6-[4-(2-chloro-pyrimidin-4-yl)-phenyl]-3-methylsulfanyl-1-phenyl-1,5-dihydro-pyrazolo[3,4-d]pyrimidin-4-one

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5-(4-Chloro-phenyl)-6-[4-(2-chloro-pyrimidin-4-yl)-phenyl]-3-methylsulfanyl-1-phenyl-1,5-dihydro-pyrazolo[3,4-d]pyrimidin-4-one is prepared from N-(4-chloro-phenyl)-4-(2-chloro-pyrimidin-4-yl)-benzamide and 5-amino-3-methylsulfanyl-1-phenyl-1H-pyrazole-4-carboxylic acid ethyl ester by following a similar procedure as described in example 2. 1H NMR (CDCl3) δ (ppm) 8.68(d, 1H), 8.15(d, 2H), 8.01(d, 2H), 7.63(d, 1H), 7.49(m, 4H), 7.32(m, 3H). 7.11(d, 2H), 2.73(s, 3H). HPLC-MS calculated C28H18Cl2N6OS (M+1+): 557.1. Found: 557.1.

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