Potassium Phosphate, Tribasic → [4-(3-Cyclopropyl-5-trifluoromethyl-benzenesulfonylamino)-4,5,6,7-tetrahydro-indazol-1-yl]-acetic acid

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Reaction Conditions

Reaction Steps

[4-(3-Bromo-5-trifluoromethyl-benzenesulfonylamino)-4,5,6,7-tetrahydro-indazol-1-yl]-acetic acid ethyl ester (51.0 mg, 0.10 mmol, example 1-8), cyclopropylboronic acid (10.4 mg, 0.12 mmol), palladium (II) acetate (1.2 mg, 0.005 mmol), tricyclohexylphosphine (2.8 mg, 0.010 mmol) and potassium phosphate (76.4 mg, 0.36 mmol) were dissolved in toluene (0.5 mL) and water (0.1 mL). The mixture was heated in a microwave oven at 180° C. for 30 minutes under an argon atmosphere. The resulting mixture was quenched with saturated ammonium chloride solution, and then extracted with ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate and concentrated in vacuo. The residue was purified by preparative HPLC to afford [4-(3-cyclopropyl-5-trifluoromethyl-benzenesulfonylamino)-4,5,6,7-tetrahydro-indazol-1-yl]-acetic acid (4.2 mg, 18.9%) as a white powder. 1H NMR (400 MHz, CD3OD) δ ppm 7.97 (s, 1H), 7.85 (s, 1H), 7.70 (s, 1H), 6.65 (s, 1H), 4.80 (s, 2H), 4.41 (t, 1H), 2.50 (m, 2H), 2.20 (m, 1H), 2.00-1.73 (m, 4H), 1.15 (, 2H), 0.85 (m, 2H). MS cald. for C19H20F3N3O4S 443, obsd. (ESI+) [(M+H)+] 444.

Provenance & Evidence