Water → 2-Chloro-5-methoxy-3-methylpyridine

関与物質

反応手順

Into a flame dried flask under N2 was placed DMF (150 mL), NaH (50% oil dispersion, 4.0 g, 0.08 mol) and 2-chloro-5-hydroxy-3-methylpyridine (11.7 g, 0.08 mol). The solution was stirred at 0°-5° C. until the evolution of H2 ceased and then a solution of CH3I (5.6 mL, 0.09 mol) in DMF (50 mL) was added dropwise. After the addition, the solution was allowed to stir at room temperature overnight. The resulting slurry was added to H2O and extracted with Et2O (3X). The organic layer was concentrated and the residue distilled at 85° C. (0.6 mm) to yield 12.8 g of 2-chloro-5-methoxy-3-methylpyridine (95%) as an oil; 1H NMR (CDCl3) δ 2.35 (3H, s), 3.8 (3H, s), 7.1 (1H, d, J=3) and 7.9 (1H, d, J=3 ); MS m/e (M+) 157.

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