Tris(1,1-dimethylethyl)phosphine → 4-(5-cyano-1-methyl-1H-pyrrol-2-yl)-N-ethyl-2-(trifluoromethoxy)benzenesulfonamide

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Reaction Steps

According to general procedure B, 4-bromo-N-ethyl-2 (trifluoromethoxy)benzenesulfonamide (208 mg, 0.59 mmol), 5-cyano-1-methyl-1H-pyrrol-2-ylboronic acid (107 mg, 0.71 mmol), potassium fluoride (113 mg, 1.95 mmol), and tris(dibenzylideneacetone)dipalladium (0) (15 mg, 0.01 mmol) were placed in an oven dried flask under nitrogen and dry THF (1.4 mL) was added. Tri-t-butylphosphine (89 μL, 0.02 mmol, 10 wt % in hexane) was added and the reaction was stirred for 16 hours. 4-(5-cyano-1-methyl-1H-pyrrol-2-yl)-N-ethyl-2-(trifluoromethoxy)benzenesulfonamide (40 mg, 18%) was provided after purification. MS (ESI) m/z 373. HPLC purity 99.4% at 210-370 nm, 9.4 min.; the Xterra® RP18 column, 3.5μ, 150×4.6 mm column, 1.2 mL/min., 85/15-5/95 (ammonium formate buffer pH=3.5/ACN+MeOH) for 10 min., hold 4 min.

Provenance & Evidence