1,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochloride → 8-chloro-N-[(4-cyano-2,5-dimethylphenyl)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 (2.5 g, 9.5 mmol, prepared as described in Example 1 Step C) in t-butanol (70 mL) and dichloromethane (70 mL) was added 4-(dimethylamino)pyridine (3.47 g, 28.4 mmol) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (4.54 g, 23.7 mmol). The reaction mixture was stirred for 15 min after which time 4-cyano-2,5-dimethylbenzenesulfonamide (1.85 g, 8.85 mmol) was added, and stirring was continued at room temperature overnight. Dichloromethane (200 mL) was then added, the mixture was washed with 1 N hydrochloric acid (3×100 mL), the organic phase was collected and dried over magnesium sulfate and then concentrated under reduced pressure to afford a solid. The solid was isolated by filtration, rinsed with diethyl ether, and recrystallized from hexane/ethyl acetate to afford 1.5 g of the title compound, a compound of the present invention, as a solid, m.p. 228-229° C. 1H NMR (CDCl3) δ 9.97 (br s, 1H), 8.47 (s, 1H), 8.26 (s, 1H), 8.24 (s, 1H), 7.56 (s, 1H), 7.54 (s, 1H), 2.71 (s, 3H), 2.63 (s, 3H).

Provenance & Evidence