Pyridine → Methyl 3-[2-bromo-4-(trifluoromethyl)phenylsulfonamido]thiophene-2-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a cooled (0° C.) solution of methyl 3-aminothiophene-2-carboxylate (534.0 mg; 3.4 mmol), 4-dimethylaminopyridine (94.3 mg; 0.77 mmol) and pyridine (2.5 mL; 30.9 mmol) in anhydrous dichloromethane (60 mL) was added 2-bromo-4-(trifluoromethyl)benzene-1-sulfonyl chloride (1.0 g; 3.09 mmol) portion-wise. After addition was complete the reaction mixture was stirred at 0° C. for 20 minutes, gradually allowed to war to room temperature, stirred for 16 hours, and then washed with aqueous hydrochloric acid (50 mL; 2N). The organic phase was dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The crude residue was purified by automated silica gel column chromatography (Biotage®) eluting with ethyl acetate/hexanes (0 to 30% v/v over 400 mL gradient elution) to give the title product as a white solid (330 mg).

Provenance & Evidence