反应详情

温度

40 °C

At 25° C., 3.0 g (8.6 mmole) of the product of step A, 1.22 g (6.0 mmole) K2CO3 and 0.79 mL (8.8 mmole) 80% propargyl bromide were slurried in 50 mL acetone. The reaction was stirred at 40° C. for 6 hours. The reaction was cooled, diluted with 100 mL cold water, and extracted four times with ethyl acetate. The ethyl acetate extracts were washed with brine, dried over anhydrous MgSO4, and stripped in vacuo. The residue was recrystallized from methylcyclohexane to give 2.97 g (89%) of 2H-1,4-benzoxazin-3(4H)-one, 6-(4-chloro-1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl)-7-fluoro-4(2-propynyl)-2H-1,4-benzoxazin-3(4H)-one as a beige solid, mp 142°-143° C.

1. customAt 25° C.
2. temperatureThe reaction was cooled
3. extractionextracted four times with ethyl acetate
4. washThe ethyl acetate extracts were washed with brine
5. dry with materialdried over anhydrous MgSO4
6. customThe residue was recrystallized from methylcyclohexane