Cl[C:2]1[C:7]([C:8]([NH:10][CH2:11][C:12]2[CH:17]=[C:16]([F:18])[CH:15]=[C:14](F)[CH:13]=2)=[O:9])=[C:6]([CH3:20])[CH:5]=[C:4]([Cl:21])[N:3]=1.C([O-])([O-])=O.[K+].[K+].[CH2:28]([SH:30])[CH3:29].O>CN(C=O)C>[Cl:21][C:4]1[N:3]=[C:2]([S:30][CH2:28][CH3:29])[C:7]([C:8]([NH:10][CH2:11][C:12]2[CH:13]=[CH:14][CH:15]=[C:16]([F:18])[CH:17]=2)=[O:9])=[C:6]([CH3:20])[CH:5]=1
A solution of 4.0 g (12.8 mmol) 2,6-dichloro-N-(3,5-difluorobenzyl)-4-methyl-pyridine-3-carboxylic acid amide in DMF (30 ml) was treated with 2.6 g (19.2 mmol) K2CO3 and 1.2 ml (16.0 mmol) ethanethiol, followed by stirring in a closed vessel at RT for 16 h. Then water (35 ml) was added and the mixture was extracted with EtOAc (2×70 ml). The combined organic layers were washed with water, a 2M aq. NaOH sol. and brine, dried over MgSO4 and concentrated in vacuo. Purification of the residue by CC (hexane/EtOAc 3:1) provided 3.3 g (9.7 mmol, 76%) 6-chloro-2-ethylsulfanyl-N-[(3-fluorophenyl)-methyl]-4-methyl-pyridine-3-carboxylic acid amide.
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