反应详情

温度

0 °C

1,1,3,3-Tetramethylguanidine (2.11 ml, 16.8 mmol) was added to a 0° C. solution of methyl 2-(tert-butoxycarbonyl)-2-(dimethoxyphosphoryl)-acetate (5.00 g, 16.8 mmol) in DCM (70 mL). The reaction mixture was stirred at 0° C. for 30 minutes. Then a solution of 4-chloro-3-fluorobenzaldehyde (2.67 g, 16.8 mmol) in DCM (10 mL) was added by syringe. The reaction mixture was stirred for 10 minutes, then warmed to room temperature and stirred for another 1 hour. H2O was then added, and the mixture was extracted with DCM. The combined extracts were dried (Na2SO4), filtered, and concentrated. The resulting solids were recrystallized from IPA to give (Z)-methyl 2-(tert-butoxycarbonyl)-3-(4-chloro-3-fluorophenyl)acrylate (3.76 g, 67.8% yield) as a white powder (2 crops). LCMS (APCI−) m/z 328 [M−H]−.

1. stirringThe reaction mixture was stirred for 10 minutes
2. temperaturewarmed to room temperature
3. stirringstirred for another 1 hour
4. extractionthe mixture was extracted with DCM
5. dry with materialThe combined extracts were dried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated
8. customThe resulting solids were recrystallized from IPA