2,6-Lutidine → HCID 10411408, 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-picoline (182 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 4/6 hexanes/ethyl acetate) afforded 2(R)-(3-chloro-4-methanesulfonyl-phenyl)-N-(5-methyl-pyridin-2-yl)-3-(4-oxo-cyclohexyl)-propionamide (231 mg, 61%) as a white foam: [α]23589=−26.22° (c=0.45, chloroform); EI-HRMS m/e calcd for C22H25ClN2O4S (M+H)+ 449.1297. found 449.1302.

Provenance & Evidence