Br[CH:2]([CH:6]([CH3:8])[CH3:7])[C:3]([OH:5])=[O:4].C1C=CC2C(C3C=CC(O)=CC=3)(C3C=CC(O)=CC=3)OC(=O)C=2C=1.[OH-].[Na+].CO.[F:37][C:38]([F:47])([F:46])[C:39]1[CH:45]=[CH:44][C:42]([NH2:43])=[CH:41][CH:40]=1.[OH-].[Na+]>CO.CN(C)C=O>[F:37][C:38]([F:46])([F:47])[C:39]1[CH:40]=[CH:41][C:42]([NH:43][C@H:2]([C:3]([OH:5])=[O:4])[CH:6]([CH3:8])[CH3:7])=[CH:44][CH:45]=1Two grams of α-bromoisovaleric acid (0.011 mole) dissolved in 10 ml of methanol is titrated to the phenolphthalein end point at 0° with 2 N sodium hydroxide/methanol. The alcohol is then removed and 10 ml of dimethylformamide and p-trifluoromethylaniline (3.54 g, 0.022 mole) added. The reaction mixture is heated at 100° for 2 hours and left at room temperature about 18 hours. The reaction mixture is poured into 50 ml of 0.1 N sodium hydroxide, washed with ether and the aqueous phase adjusted to pH 4 with conc. HCl and then extracted with chloroform (3×). The extracts are combined and washed with brine, dried, concentrated in a rotoevaporator and solvent removed under vacuum at about 50° to yield N-(p-trifluoromethylphenyl)valine.
Wird geladen…
