C([O:3][C:4](=O)[CH2:5][C:6]([C:8]1[CH:13]=[CH:12][N:11]=[CH:10][C:9]=1[F:14])=O)C.[CH3:16][NH:17][C:18]([NH2:20])=[S:19].N12CCCN=C1CCCCC2.CS(O)(=O)=O>C1(C)C=CC=CC=1.O>[F:14][C:9]1[CH:10]=[N:11][CH:12]=[CH:13][C:8]=1[C:6]1[N:20]=[C:18]([SH:19])[N:17]([CH3:16])[C:4](=[O:3])[CH:5]=1A suspension of 3-(3-fluoropyridin-4-yl)-3-oxo-propionic acid ethyl ester (60.3 g, 286 mmol), N-methylthiourea (88 g, 976 mmol) and 1,8-diazabicyclo[5,4,0]undec-7-ene (48 g, 315 mmol) in toluene (600 ml) was heated at 100° C. for 5 hour. After addition of water (2000 ml) and methanesulfonic acid (30.3 g, 315 mmol) at room temperature and stirring for one hour, resulting precipitate was collected by filtration and dried to afford 6-(3-fluoropyridin-4-yl)-2-mercapto-3-methyl-3H-pyrimidin-4-one (46.3 g, 195 mmol, 68%) as white crystals.
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