5-amino-1-phenyl-1H-pyrazole-3,4-dicarboxylic acid diethyl ester → 6-Biphenyl-4-yl-5-(4-chloro-phenyl)-4-oxo-1-phenyl-4,5-dihydro-1H-pyrazolo[3,4-d]pyrimidine-3-carboxylic acid ethyl ester

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Reaction Steps

6-Biphenyl-4-yl-5-(4-chloro-phenyl)-4-oxo-1-phenyl-4,5-dihydro-1H-pyrazolo[3,4-d]pyrimidine-3-carboxylic acid ethyl ester is prepared from 5-amino-1-phenyl-1H-pyrazole-3,4-dicarboxylic acid diethyl ester and N-(4-chloro-phenyl)-biphenyl-4-carboximidoyl chloride by following a similar procedure as described in example 2 and purified by preparative LC/MS. 1H NMR (CDCfe) δ(ppm) 8.14(d, 2H), 7.36˜7.57(m, 12H), 7.33(d, 2H), 7.14(d, 2H), 4.53(q, 2H), 1.46(t, 3H); HPLC-MS calculated for C32H23ClN4O3 (M+H+): 547.2. Found: 547.2.

Provenance & Evidence