Sodium methanesulfinate → [(R)-4-(3-methanesulfonyl-5-trifluoromethyl-benzenesulfonylamino)-4,5,6,7-tetrahydro-indazol-1-yl]-acetic acid ethyl ester

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Reaction Conditions

Reaction Steps

[(R)-4-(3-Bromo-5-trifluoromethyl-benzenesulfonylamino)-4,5,6,7-tetrahydro-indazol-1-yl]acetic acid ethyl ester (118.0 mg, 0.20 mmol), methanesulfinic acid sodium salt (24.5 mg, 0.24 mmol), copper(I) iodide (4.0 mg, 0.02 mmol) and L-proline sodium salt (3.2 mg, 0.04 mmol) were dissolved in dimethyl sulfoxide (1.5 mL) and water (0.3 mL). The mixture was heated in a microwave oven at 150° C. for 30 minutes. The resulting mixture was diluted with water and extracted with ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate, concentrated and purified by column chromatography (gradient elution, 0-5% methanol in dichloromethane) to afford [(R)-4-(3-methanesulfonyl-5-trifluoromethyl-benzenesulfonylamino)-4,5,6,7-tetrahydro-indazol-1-yl]-acetic acid ethyl ester (52.0 mg, 51.1%) as a white solid. MS calcd. for C19H22F3N3O6S2 509, obsd. (ESI+) [(M+H)+] 510.

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