CS(C)=O.[H-].[Na+].[I-].[CH3:8][S+](C)C.[CH3:12][C:13]1[N:18]=[CH:17][C:16]([C:19](=[O:21])[CH3:20])=[CH:15][N:14]=1>C1COCC1>[CH3:12][C:13]1[N:18]=[CH:17][C:16]([C:19]2([CH3:8])[CH2:20][O:21]2)=[CH:15][N:14]=1DMSO is added to NaH (1-1.8 equiv.) and heated to 65° C. for 1 h. THF is added at the same temperature and heated for another 10 min. After 10 min., the reaction mixture is cooled to 0° C. Trimethylsulfonium iodide (1-1.2 equiv.) is added and the contents stirred for 10 min. after which the solution of 1-(2-methylpyrimidin-5-yl)ethanone (1 equiv.) in THF is added dropwise. After complete addition, the reaction mixture is stirred at RT for 2 h; the reaction is monitored by LCMS. The reaction mixture is poured in ice water, extracted in diethyl ether, dried over sodium sulfate and concentrated at 25° C. to get the crude product.
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