Dicyclohexylcarbodiimide → {3-[3-(2-methoxy-phenyl)-1H-pyrazolo[3,4-b]pyridin-5-yl]-phenyl}-(4-methyl-piperazin-1-yl)-methanone

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To a solution of 3-[3-(2-methoxy-phenyl)-1H-pyrazolo[3,4-b]pyridin-5-yl]-benzoic acid (25 mg, 72 μmol) in anhydrous DMF (1.5 mL) was added PS-DCC resin (Argonaut Technologies) (180 mg, 0.22 mmol, 1.21 mmol·g−1) and N-methylpiperazine (9.6 μl, 86 μmol). The resulting mixture was stirred at 60° C. for 16 h. The resin was filtered off, washing with dichloromethane and ether and the filtrate concentrated. The residue was dissolved in dichloromethane and treated with a PS-trisamine resin (Argonaut Technologies) (20 mg). The resin was again removed by filtration and washed with dichloromethane and ether. The filtrate was concentrated and the resulting crude product was purified by reverse phase mass-triggered HPLC using a gradient of acetonitrile in water containing 0.1% of formic acid to afford {3-[3-(2-methoxy-phenyl)-1H-pyrazolo[3,4-b]pyridin-5-yl]-phenyl}-(4-methyl-piperazin-1-yl)-methanone (1.7 mg, 4.0 μmol, 6% yield). 1H-NMR (500 MHz, d6-DMSO) δ 8.87 (d, 1H), 8.37 (d, 1H), 8.24 (t, 1H), 8.02 (dt, 1H), 7.98 (dt, 1H), 7.68 (dd, 1H), 7.64 (t, 1H), 7.47 (ddd, 1H), 7.23 (d, 1H), 7.11 (dt, 1H), 3.86 (s, 3H). MS: m/z 346 [MH+].

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