反应详情

To a solution of 4-nitro-2-(1H-1,2,4-triazol-1-yl)pyridine 1-oxide (0.643 g, 3.10 mmol) in CHCl3 (30 mL) at 0° C. was added diethyl chlorophosphite (1.35 mL, 9.31 mmol). The reaction mixture was allowed to stir at rt for 72 h. Additional diethyl chlorophosphite (1.35 mL, 9.31 nmmol) was added and the reaction mixture was heated at 80° C. for 18 h. The reaction mixture was cooled to 0° C., basified by the addition of 1N NaOH solution and extracted with DCM. The organic solutions were combined, washed with brine, dried over Na2SO4, filtered and concentrated. The residue was purified by column chromatography. The product was triturated with hexane to provide 4-nitro-2-(1H-1,2,4triazol-1-yl)pyridine (0.192 g, 32.3%). LCMS: (FA) ES+ 192.3.

1. temperaturethe reaction mixture was heated at 80° C. for 18 h
2. temperatureThe reaction mixture was cooled to 0° C.
3. extractionextracted with DCM
4. washwashed with brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated
8. customThe residue was purified by column chromatography
9. customThe product was triturated with hexane