Hydrochloric Acid → HCID 22315123, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-propionic acid (prepared as in Example 14, 250 mg, 0.732 mmol), triethylamine (0.306 mL, 2.19 mmol), benzotriazol-1-yloxy-tris(dimethylamino)phosphonium hexafluorophosphate (487 mg, 1.10 mmol), and 2-aminopyrazine (105 mg, 1.10 mmol) in methylene chloride (5 mL) was stirred at 25° C. for 18 h. The reaction mixture was then diluted with water (25 mL), a 1N aqueous hydrochloric acid solution (5 mL), and ethyl acetate (25 mL). The layers were separated, and the organic layer was dried over magnesium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40S, Silica, 19/1 methylene chloride/methanol) afforded impure 3-cyclopentyl-2-(4-methanesulfonyl-3-nitro-phenyl)-N-pyrazin-2-yl-propionamide as a white foam. This white foam was dissolved in ethyl acetate (2 mL) and then added to hexanes (50 mL). A white precipitate formed, and the solid was collected by filtration to afford 3-cyclopentyl-2-(4-methanesulfonyl-3-nitro-phenyl)-N-pyrazin-2-yl-propionamide (23.3 mg, 7.6%) as a white solid: mp 104-108° C. (gel formation); EI-HRMS m/e calcd for C19H22N4O5S (M+) 418.1311, found 418.1309.

Provenance & Evidence