[H-].[Na+].[CH:3]1([SH:9])[CH2:8][CH2:7][CH2:6][CH2:5][CH2:4]1.Cl[C:11]1[N:18]=[C:17]([C:19]([F:22])([F:21])[F:20])[CH:16]=[CH:15][C:12]=1[C:13]#[N:14].[NH4+].[Cl-]>CN(C=O)C.O>[CH:3]1([S:9][C:11]2[N:18]=[C:17]([C:19]([F:22])([F:20])[F:21])[CH:16]=[CH:15][C:12]=2[C:13]#[N:14])[CH2:8][CH2:7][CH2:6][CH2:5][CH2:4]1
1.3 Equivalents of NaH (4.9 g, 0.124 mol) were dissolved in 50 mL of DMF under a blanket of nitrogen. Following the addition of 1.2 equivalents of cyclohexanethiol (14.2 mL, 0.116 mol), the mixture was stirred at RT over a period of 1.5 h. The resulting suspension was cooled to 10° C. and added dropwise to 1 equivalent of 2-chloro-6-(trifluoromethyl)nicotinonitrile (20 g, 0.096 mol) in 50 mL of DMF and stirred over a period of 2 h at RT. To the reaction mixture there was added sat. aq. NH4Cl soln. and the mixture was diluted with 1 L of water and extracted with EA (3×200 mL). The combined organic phases were washed with sat. aq. NaCl solution, dried over MgSO4 and concentrated in vacuo. Column chromatographic purification (silica gel 100-200 mesh, eluant: 2% EA in hexane) yielded 26 g (93.8%) of product.
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