tert-Butanol → 8-chloro-N-[(2-chloro-5-ethylphenyl)sulfonyl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine-2-carboxamide

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Reaction Steps

To a solution of 8-chloro-6-(trifluoromethyl)imidazo[1,2-c]pyridine-2-carboxylic acid (100 mg, 0.38 mmol, prepared as described in Example 1 Step C) in a 1:1 mixture of t-butanol (5 mL) and dichloromethane (5 mL) was added 4-(dimethylamino)pyridine (138 mg, 1.1 mmol) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (182 mg, 0.95 mmol). The reaction mixture was stirred for 15 min, 2-chloro-5-ethylbenzenesulfonamide (74 mg, 0.34 mmol) was added, and the reaction mixture was stirred at room temperature overnight. Dichloromethane (100 mL) was then added, the mixture was washed with 1 N hydrochloric acid (3×50 mL), and the organic phase was dried over magnesium sulfate and concentrated under reduced pressure to afford a solid. The solid was rinsed with diethyl ether to afford 84 mg of the title compound, a compound of the present invention, as a solid, m.p. 214-215° C. 1H NMR (CDCl3) δ 10.12 (br s, 1H), 8.45 (s, 1H), 8.26 (s, 1H), 8.20 (s, 1H), 7.53 (s, 1H), 7.40 (s, 2H), 2.77 (q, 2H), 1.30 (t, 3H).

Provenance & Evidence