Cl[C:2]1[CH:7]=[CH:6][N:5]=[C:4]([S:8][CH3:9])[N:3]=1.C(=O)([O-])[O-].[K+].[K+].[F:16][C:17]([F:21])([F:20])[CH2:18][OH:19]>CN(C=O)C.O>[CH3:9][S:8][C:4]1[N:3]=[C:2]([O:19][CH2:18][C:17]([F:21])([F:20])[F:16])[CH:7]=[CH:6][N:5]=1To a solution of 4-chloro-2-methylthiopyrimidine (16.0 g) and potassium carbonate (27.6 g) in DMF (90 ml) at 0° C., was added with stirring a solution of 2,2,2-trifluoroethanol (10.0 g) in DMF (10 ml). Stirring was continued for 64 hours, then the reaction mixture was diluted with water and extracted with ether (3×150 ml). The combined extracts were washed with brine, dried and concentrated to give 2-methylthio-4-(2,2,2-trifluoroethoxy)pyrimidine (23.0 g, crude yield) as a clear pale orange oil, 1H NMR δ 2.57(3H,s); 4.79(2H,q); 6.54(1H,d); 8.33(1H,d) ppm.
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