Triethylamine → 1-(4-phenylamino-phenyl)-3-[1-(2-pyrrolidin-1-yl-ethyl)-1H-indazol-5-yl]-urea

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A mixture of 1-(4-amino-phenyl)-3-[1-(2-pyrrolidin-1-yl-ethyl)-1H-indazol-5-yl]-urea (364 mg, 1 mmol), phenylboronic acid (244 mg, 2 mmol), copper(II) acetate (364 mg, 2 mmol), triethylamine (0.2 mL, 2 mmol), in 20 mL of dichloromethane was refluxed overnight. The mixture was concentrated under reduced pressure and the residue was purified by flash chromatography (acetonitrile/ethyl acetate/triethylamine, 10/4/1) to provide the title compound as a pale white solid (200 mg, 45%). 1H NMR (300 MHz, DMSO-d6) ppm 1.63 (m, 4H), 2.45 (m, 4H), 2.86 (d, J=6.44, 2H), 4.46 (d, J=6.44, 2H), 6.74 (m, 1H), 6.98 (m, 2H), 7.03 (m, 2H), 7.18 (m, 1H), 7.33–7.36 (m, 3H), 7.58 (m, 1H), 7.88 (m, 1H), 7.90 (s, 1H), 7.95 (s, 1H), 8.44 (s, 1H), 8.55 (s, 1H); MS (DCI/NH3) m/z 441 [M+H]+.

Provenance & Evidence