Water → HCID 86648988, compound
Reaction equation
P(Cl)(Cl)(Cl)=O.[Cl:6][C:7]1[CH:12]=[N:11][CH:10]=[C:9]([N:13]2[CH2:18][CH2:17][CH2:16][CH2:15][CH:14]2[CH3:19])[N:8]=1.O.CN([CH:24]=[O:25])C>>[Cl:6][C:7]1[C:12]([CH:24]=[O:25])=[N:11][CH:10]=[C:9]([N:13]2[CH2:18][CH2:17][CH2:16][CH2:15][CH:14]2[CH3:19])[N:8]=1Participants
5
Procedure
Phosphoryl chloride (1.62 mL) was added dropwise to DMF (5 ml) at 0° C. The mixture was stirred for 15 min, and a solution of 2-chloro-6-(2-methylpiperidin-1-yl)pyrazine (1.85 g) in DMF (1 mL) was added dropwise thereto. The mixture was stirred at 80° C. for 16 hr, water (5 mL) was added at 0° C., and the mixture was stirred at room temperature for 1.5 hr. The mixture was extracted with ethyl acetate. The aqueous layer was extracted again with ethyl acetate. The combined organic layer was washed with water and saturated brine, dried over magnesium sulfate, and concentrated. The residue was purified by recrystallization (ethyl acetate-hexane) to give the title compound (1.18 g, 57%) as a colorless powder.