With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.18480-53-0,3,4-Dichloroisothiazole-5-carboxylic acid,as a common compound, the synthetic route is as follows.
3,4-Dichloroisothiazol-5-carboxylic acid (0.235 g, 1.2 mmol), dichloromethane (6 ml), N,N-dimethylformamide (2 drops) were added dropwise to the reaction flask. Add oxalyl chloride (1 g, 8 mmol),The reaction solution was stirred at room temperature for 4 hours.The solvent was then evaporated to give 3,4-dichloroisothiazol-5-carbonyl chloride, which was dissolved in dichloromethane (2 mL).Then 4-fluoro-2-(2-pentyloxy)aniline (0.197 g, 1 mmol) was added to the reaction flask and triethylamine (0.13 mL) was added.Further, a 3,4-dichloroisothiazol-5-formyl chloride solution was added dropwise to the reaction flask, and the mixture was stirred at room temperature for 16 hours.Then after monitoring the reaction by thin layer chromatography,Water was added to the reaction mixture, and the mixture was extracted with ethyl acetate.The organic layer was washed with saturated brine.After drying over anhydrous sodium sulfate, it was concentrated under reduced pressure.The residue was purified by column chromatography (eluent: petroleum ether: ethyl acetate = 20:1).Obtained a fresh yellow solid of 0.236 g.The yield was 62.76percent.
As the paragraph descriping shows that 18480-53-0 is playing an increasingly important role.
Reference£º
Patent; Shanghai Taihe International Trade Co., Ltd.; Ma Wenjing; Lv Liang; Li Hongwei; Hou Shuang; Du Yonglei; Liu Jiyong; (31 pag.)CN108383791; (2018); A;,
Isothiazole – Wikipedia
Isothiazole – ScienceDirect.com