[CH3:1][O:2][C:3](=[O:12])[C:4]1[CH:9]=[CH:8][C:7]([CH3:10])=[N:6][C:5]=1Cl.C([O-])([O-])=O.[Cs+].[Cs+].[CH3:19][CH:20]([SH:22])[CH3:21]>CN(C=O)C>[CH3:1][O:2][C:3](=[O:12])[C:4]1[CH:9]=[CH:8][C:7]([CH3:10])=[N:6][C:5]=1[S:22][CH:20]([CH3:21])[CH3:19]2-Chloro-6-methyl-nicotinic acid methyl ester (1.39 g, 7.44 mmol) obtained in Step A was dissolved in DMF (15 mL). Cs2CO3(4.88 g, 14.99 mmol) and propane-2-thiol (1.39 mL, 14.99 mmol) were added to the solution, and the mixture was stirred at room temperature for 2 hours. The reactant was concentrated under reduced pressure to remove the solvent. The residue was added with water and then extracted with EtOAc. The organic layer was dried with MgSO4, filtered and concentrated under reduced pressure. The obtained residue was purified by column chromatography (eluent EtOAc/Hex=1/5) to obtain the title compound (1.17 g, 69%).
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