[NH2:1][C:2]1[N:7]=[C:6]([C:8]([OH:10])=O)[C:5]([O:11][C:12]2[N:17]=[C:16]([O:18][CH3:19])[CH:15]=[C:14]([O:20][CH3:21])[N:13]=2)=[CH:4][CH:3]=1.[CH2:22]([SH:24])[CH3:23].P(OC#N)(OCC)(OCC)=O.C(N(CC)CC)C>O.C1COCC1>[NH2:1][C:2]1[N:7]=[C:6]([C:8](=[O:10])[S:24][CH2:22][CH3:23])[C:5]([O:11][C:12]2[N:17]=[C:16]([O:18][CH3:19])[CH:15]=[C:14]([O:20][CH3:21])[N:13]=2)=[CH:4][CH:3]=12.5 g (8.5 mmol) of 6-amino-3-[(4,6-dimethoxypyrimidin-2-yl)oxy]picolinic acid, 0.64 g (10.3 mmol) of ethylmercaptan, 2.8 g (17 mmol) of diethyl cyano phosphate and 1.73 g (17.1 mmol) of triethylamine were added to a THF solution, and the mixture was stirred at room temperature for 4 hours. After completion of the reaction, the reaction mixture was poured into water and extracted with ethyl acetate, followed by separation, washed with water and dried. Then, the solvent was distilled off, and the residual oily product was purified by column chromatography to obtain the desired product as colorless transparent crystals.
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