Thiourea → HCID 68760757、化合物

To a solution of methyl 3-amino-4-chloro-2-[(3-hydroxypropyl)amino]benzoate (2.00 g) in tetrahydrofuran (40.0 mL) was added 3-isothiocyanato-6-methoxy-2-methylpyridine (1.67 g, 9.277 mmol). The reaction mixture was stirred at 70° C. for 14 hrs. The starting material wasn't consumed completely. To the mixture was added 3-isothiocyanato-6-methoxy-2-methylpyridine (1.67 g, 9.277 mmol). The reaction mixture was stirred at 70° C. for 36 hrs. After cooling, the solvent was removed by concentration. The residue was purified by silica gel column chromatography eluting with a 30-80% ethyl acetate/n-hexane gradient mixture to give the mixture contained thiourea and title compound. The mixture was subject to next step without further purification. The mixture was dissolved into tetrahydrofuran (30 mL) were added 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (885.7 mg, 4.62 mmol) and triethylamine (0.71 mL, 5.08 mmol). The reaction mixture was stirred at 50° C. for 2 hrs. After cooling, the mixture was diluted with water, extracted with ethyl acetate (×3). The combined organic layer was washed with brine (×1), dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue was washed with diisopropyl ether to give the title compound as a colorless solid (1.50 g, 3.72 mmol, 48% (2 steps)).