2,6-Lutidine → HCID 10412371, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-(4-oxo-cyclohexyl)-propionic acid (prepared as in Example 60, 300 mg, 0.84 mmol) and triphenylphosphine (288 mg, 1.09 mmol) in methylene chloride (6.0 mL) cooled to 0° C. was treated with N-bromosuccinimide (192 mg, 1.09 mmol) in small portions. After the complete addition of N-bromosuccinimide, the reaction mixture was allowed to warm to 25° C. over 30 min. The bright orange reaction mixture was then treated with 2-amino-5-chloropyridine (220 mg, 1.68 mmol) and 2,6-lutidine (0.42 mL, 3.36 mmol). The resulting reaction mixture was stirred at 25° C. for 4 h. The reaction mixture was then diluted with methylene chloride (25 mL) and was successively washed with a 10% aqueous hydrochloric acid solution (1×20 mL), a saturated aqueous sodium bicarbonate solution (1×20 mL) and water (1×20 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40S, Silica, 65/35 hexanes/ethyl acetate to 1/1 hexanes/ethyl acetate) afforded 2(R)-(3-chloro-4-methanesulfonyl-phenyl)-N-(5-chloro-pyridin-2-yl)-3-(4-oxo-cyclohexyl)-propionamide (265 mg, 67%) as a white foam: [α]23589=−35.71° (c=0.35, chloroform); EI-HRMS m/e calcd for C21H22Cl2N2O4S (M+H)+ 469.0750, found 469.0754.

Provenance & Evidence