C([O:3][C:4](=[O:23])[CH:5]([CH2:11][C:12]1[CH:17]=[C:16]([C:18]([F:21])([F:20])[F:19])[CH:15]=[CH:14][C:13]=1[Br:22])C(OCC)=O)C.[OH-].[Na+]>C(O)C.O>[Br:22][C:13]1[CH:14]=[CH:15][C:16]([C:18]([F:21])([F:20])[F:19])=[CH:17][C:12]=1[CH2:11][CH2:5][C:4]([OH:23])=[O:3]To a solution of diethyl[2-bromo-5-(trifluoromethyl)benzyl]malonate (22.9 g, 57.6 mmol) in ethanol (100 mL) and water (50 mL) was added a 5 M solution of sodium hydroxide in water (30 mL). The mixture was heated to reflux for 2 h. Ethanol was removed by evaporation. The aqueous layer was extracted with ether and then acidified with concentrated HCl to pH 5 at which time a lot of white solid precipitated out. The solid was collected by filtration. The filtrate was extracted with ethyl acetate twice, and the extracts were washed with brine, dried (MgSO4) and concentrated to give a white solid.
Wird geladen…
