Water → 4,6-Dibromo-2-chloro-3-(difluoromethoxy)pyridine

関与物質

反応条件

反応手順

Potassium carbonate (K2CO3; 5.01 g, 36.3 mmol) and H2O (4 mL) were added to a microwave reaction vessel. 4,6-Dibromo-2-chloropyridin-3-ol (0.359 g, 1.25 mmol) was dissolved in CH3CN (4 mL) and added to the microwave reaction vessel. 2-Chloro-2,2-difluoro-1-phenylethanone (0.953 g, 5.00 mmol) was then added, and the microwave reaction vessel was sealed. The reaction mixture was heated with vigorous stirring with a large stir bar in a Biotage microwave reactor at 100° C. for 4 h. (The reaction mixture is biphasic, and the reaction will not proceed to completion without vigorous stirring.) The reaction mixture was then partitioned between EtOAc and H2O. The organic phase was washed once more with H2O, dried and concentrated. The product was redissolved in CH2Cl2 and filtered through short plug of silica gel utilizing CH2Cl2 as the eluting solvent. The eluent was concentrated to provide the title compound as a light yellow low-melting solid (0.325 g, 0.963 mmol, 77%): 1H NMR (300 MHz, CDCl3) δ 7.73 (s, 1H), 6.63 (t, J=73.1, 1H); EIMS m/z 337.

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