Sodium Iodide → Methyl 4-iodo-2-methylnicotinate
反応式
Cl[C:2]1[C:7]([C:8]([O:10][CH3:11])=[O:9])=[C:6]([CH3:12])[N:5]=[CH:4][CH:3]=1.C(Cl)(=O)C.[I-:17].[Na+]>C(#N)C>[I:17][C:2]1[C:7]([C:8]([O:10][CH3:11])=[O:9])=[C:6]([CH3:12])[N:5]=[CH:4][CH:3]=1Cl[C:2]1[C:7]([C:8]([O:10][CH3:11])=[O:9])=[C:6]([CH3:12])[N:5]=[CH:4][CH:3]=1.C(Cl)(=O)C.[I-:17].[Na+]>C(#N)C>[I:17][C:2]1[C:7]([C:8]([O:10][CH3:11])=[O:9])=[C:6]([CH3:12])[N:5]=[CH:4][CH:3]=1To a solution of methyl 4-chloro-2-methylnicotinate (6.00 g, 32.3 mmol) in acetonitrile (80 mL) was added acetyl chloride (3.45 mL, 48.5 mmol) followed by sodium iodide (48.5 g, 323 mmol). The reaction mixture was heated at 80° C. for 16 hrs. The reaction mixture was evaporated to dryness and the residue was adjusted to pH 6 by adding saturated potassium carbonate solution. The product was extracted with dichloromethane (250 mL). The organic phase was washed with brine (2×100 mL), dried over Na2SO4, and concentrated under reduced pressure to afford methyl 4-iodo-2-methylnicotinate (2.00 g, 7.22 mmol, 22% crude yield) as colorless semisolid which was carried on without further purifications. LC/MS (ESI) m/e 278.0 [(M+H)+, calcd for C8H9INO2 278.0]; LC/MS retention time (method C): tR=2.13 min.
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