Isothiazole-5-carboxylic acid, cas is 10271-85-9, it is a common heterocyclic compound, the isothiazole compound, its synthesis route is as follows.,10271-85-9
To a stirred solution isothiazole-5-carboxylic acid 46 (1.75 g, 13.56 mmol) in CH2Cl2 (50 mL) under inert atmosphere were added N, O-dimethylhydroxylamine (1.45 g, 14.92 mmol), EDCI.HCl (2.85 g, 14.92 mmol), DMAP (1.66 g, 13.56 mmol) and N-methylmorpholine (4.1 mL, 40.69 mmol) at 0 oC, followed by warming to room temperature and stirring for 16 h. The reaction was monitored by TLC. After completion of the reaction, the reaction mixture was poured into ice-cold water, extracted with CH2Cl2. The combined organic extracts were dried over sodium sulfate, filtered and concentrated in vacuo to obtain the crude. The crude was purified through silica gel column chromatography using 2% MeOH/ CH2Cl2 to afford compound 47 (1.2 g, 52%) as brown syrup. TLC: 5% MeOH/ CH2Cl2 (Rf: 0.2); 1H NMR (400 MHz, DMSO-d6): delta 8.64 (d, J = 1.8 Hz, 1H), 7.96 (d, J = 1.8 Hz, 1H), 3.82 (s, 3H), 3.33 (s, 3H); LCMS Calculated for C6H8N2O2S: 172.03; Observed: 173.1 (M+1)+.
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Reference£º
Patent; ASSEMBLY BIOSCIENCES, INC.; TURNER, William, W., Jr.; LI, Leping; HAYDAR, Simon, Nicolas; BURES, Mark, G.; RAI, Roopa; FRANCIS, Samson; ARNOLD, Lee, Daniel; (0 pag.)WO2018/160878; (2018); A1;,
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