To a solution of Ethyl 3-bromo-5-(4-chlorophenyl)-4-(dimethylamino)thiophene-2-carboxylate (compound 34d, 2.20 g, 5.65 mmol) in a mixture of toluene:ethanol (10 ml:30 ml) was added (4-sulfamoylphenyl)boronic acid (1.25 g, 6.22 mmol) and potassium carbonate (1.56 g, 11.30 mmol) at 25° C. Nitrogen gas was bubbled through the reaction mixture for 15 minutes. To the reaction mixture was then added tetrakis(triphenylphosphine)palladium(0) (0.32 g, 0.28 mmol) under nitrogen and the reaction mixture was heated at about 95 to about 100° C. for 16 hr under stirring. The progress of the reaction was monitored by TLC. The reaction mixture was then cooled to 25° C. and filtered through celite. The celite cake was then washed with ethanol (2×25 ml). The combined filtrate was concentrated under reduced pressure to obtain a crude product, which was then purified by flash column chromatography using 55% ethyl acetate in hexanes as an eluent to obtain the title compound (2.0 g, 76.05%).
