Potassium Carbonate → 5-chloro-4-(6-chloro-2'-fluoro-4-iodobiphenyl-3-yloxy)-N-(2,4-dimethoxybenzyl)-2-fluoro-N-(1,3,4-thiadiazol-2-yl)benzenesulfonamide

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Reaction Steps

6-Chloro-2′-fluoro-4-iodobiphenyl-3-ol (Preparation 94, 651 mg, 1.75 mmol) was added to a mixture of 5-chloro-N-(2,4-dimethoxybenzyl)-2,4-difluoro-N-(1,3,4-thiadiazol-2-yl)benzenesulfonamide (Preparation 16, 671 mg, 1.85 mmol) and potassium carbonate (967 mg, 7.00 mmol) in dimethylsulfoxide (17.5 mL) and the mixture stirred at room temperature for 18 hours. The reaction was quenched by addition of 0.75 N aq. sodium hydroxide (30.0 mL) and ethyl acetate (30 mL). The aqueous layer was separated and extracted with ethyl acetate (3×10 mL). The combined organic phases were washed with brine (10 mL), dried over MgSO4, filtered and evaporated. The residue was purified on silica, eluting with ethyl acetate:heptanes (3:7) to give the title compound as a mixture of regioisomers (930 mg, 67%). Further purification by preparative HPLC using acetonitrile/water as eluent (5/95-95/5, Phenomenex Luna C18 5 u 110 A 21.2×150 mm) gave the title compound (600 mg, 43%) as a white solid.

Provenance & Evidence