Trichloroacetyl chloride → n-{2-[4-(2-Tert-butyl-1,1,3-trioxo-2,3-dihydro-1h-1lambda6-isothiazol-5-yl)-phenyl]-1-cyano-ethyl}-3-trifluoromethyl-benzenesulfonamide

Participants

Reaction Conditions

Reaction Steps

A solution of 1.37-B of Step 2 (367 mg, 0.66 mmol) in methylene chloride (7.6 mL) was treated with triethylamine (274 μL, 2.0 mmol) followed by trichloroacetyl chloride (117 μL, 1.1 mmol) at 0° C. The reaction mixture was stirred at 0° C. for 2 h, diluted with ethyl acetate (25 mL), washed with water (2×20 mL) and brine (20 mL), dried with sodium sulfate, filtered, and concentrated to a crude residue which was purified by flash column chromatography to yield the desired product (158 mg, 45%). LCMS found for C23H26F3N4O5S2 (M+NH4)+: m/z=559.

Provenance & Evidence