[Cl:1][C:2]1[C:7]([F:8])=[CH:6][C:5]([C:9]2[C:14]([C:15](O)=[O:16])=[CH:13][N:12]=[CH:11][CH:10]=2)=[C:4]([F:18])[CH:3]=1.S(Cl)(Cl)=O.Cl.CN.C[CH2:27][N:28](C(C)C)C(C)C>ClCCl>[Cl:1][C:2]1[C:7]([F:8])=[CH:6][C:5]([C:9]2[C:14]([C:15]([NH:28][CH3:27])=[O:16])=[CH:13][N:12]=[CH:11][CH:10]=2)=[C:4]([F:18])[CH:3]=1
4-(4-chloro-2,5-difluorophenyl)nicotinic acid (170 mg, 0.630 mmol) was taken in thionyl chloride (0.14 mL, 1.89 mmol) and heated at 65° C. for 1 h. The solvent was evaporated under reduced pressure to afford a crude oil which was dissolved in dichloromethane and added to a mixture of methanamine hydrochloride (63.9 mg, 0.946 mmol) and DIEA (0.11 mL, 0.63 mmol) in DCM (8 mL) dropwise at 0° C. The reaction mixture was then allowed to warm to room temperature and stirred for 7 h. The reaction mixture was diluted with DCM (5 mL) and washed with water (3×5 mL) followed by brine (1×10 mL). The combined organic extracts were dried over sodium sulfate and concentrated under reduced pressure to provide the crude product which was purified by preparative thin layer chromatography (3:2 Ethyl acetate:hexane) to afford 4-(4-chloro-2,5-difluorophenyl)-N-methylnicotinamide (90 mg, 0.264 mmol, 42% yield) as a white solid. LC/MS (ESI) m/e 283.0 [(M+H)+, calcd for C13H10ClF2N2O 283.0]; LC/MS retention time (method A): tR=1.46 min.
Loading…
