Hydrochloric Acid → RO-4597014

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A solution of 2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-[5-((S)-2,2-dimethyl-[1,3]dioxolan-4-yl)-pyrazin-2-yl]-propionamide (8.85 g, 17.4 mmol) in tetrahydrofuran (50 mL) was treated with a 1N aqueous hydrochloric acid solution (50 mL). The resulting milky reaction mixture was stirred at 25° C., and within 15 min, the milky reaction mixture became clear. The stirring was continued at 25° C. for 16 h. The reaction was concentrated in vacuo, and the residue was extracted with methylene chloride (1×100 mL then 2×50 mL). Each organic extract was washed with a saturated aqueous sodium bicarbonate solution (50 mL) and a saturated aqueous sodium chloride solution (50 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40L, Silica, 1/1 ethyl acetate/hexanes then 100% ethyl acetate) afforded 2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-[5-(1(S),2-dihydroxy-ethyl)-pyrazin-2-yl]-propionamide (7.15 g, 88%) as a colorless foam: (ES)+-HRMS m/e calcd for C21H26ClN3O5S (M+H)+ 468.1355, found 468.1360.

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