C(C1[C:8]([C:9]([F:12])([F:11])[F:10])=[CH:7][CH:6]=[CH:5][N:4]=1)#N.[CH3:13][Mg]I.C([O:18][CH2:19][CH3:20])C.Cl>C1COCC1>[C:19]([C:20]1[C:8]([C:9]([F:12])([F:11])[F:10])=[CH:7][CH:6]=[CH:5][N:4]=1)(=[O:18])[CH3:13]
Dissolve 2-cyano-3-trifluoromethylpyridine (30.0 g, 0.174 moles) in anhydrous THF (200 mL) under N2 atmosphere and cool in an ice bath. Add drop wise 3.0 M MeMgI in diethyl ether (120 ml, 0.348 mol) to the reaction mixture and stir in an ice bath for 30 minutes. Pour the reaction mixture over ice cold water, acidify the mixture with 2.0 N aq. HCl to pH 2 to 3. Extract the reaction mixture with EtOAc (3×300 mL) and dry over anhydrous MgSO4. Filter, concentrate under vacuum to afford crude product. Purify the crude product by vacuum distillation to afford desired 2-acetyl-3-trifluoromethylpyridine as colorless oil.
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