反应详情

温度

-75 °C

To a 1.4 M solution of sec-butyllithium in cyclohexane (6.7 mL) and anhydrous tetrahydrofuran (15 mL) at −75° C. was added 1,2-difluoro-4-(2-methylallyloxy)benzene (731) (1.6 g, 8.68 mmol). The resulting mixture was stirred at −75° C. for 2.5 hours and was then transferred to a round bottom flask containing dry ice. The resulting mixture was shaken for 5 min, and water (10 mL) was added dropwise. The mixture was acidified to pH 1 with concentrated hydrochloric acid and extracted with EtOAc (80 mL×3). The organic phase was washed with brine (60 mL×2), water (60 mL), and dried over anhydrous sodium sulfate, and the solvent removed in vacuo to give an oil 2,3-difluoro-6-(2-methylallyloxy)benzoic acid (732) (1.9 g), The product was used directly in the next step without further purification.

1. customwas then transferred to a round bottom flask
2. stirringThe resulting mixture was shaken for 5 min
3. extractionextracted with EtOAc (80 mL×3)
4. washThe organic phase was washed with brine (60 mL×2), water (60 mL)
5. dry with materialdried over anhydrous sodium sulfate
6. customthe solvent removed in vacuo