With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.55687-23-5,6-Fluoroquinoxalin-2(1H)-one,as a common compound, the synthetic route is as follows.
55687-23-5, A solution of 6-fluoroquinoxalin-2(1H)-one & 7-fluoroquinoxalin-2(1H)-one (3 g, 18.28 mmol) in POCl3 (20 ml) was refluxed for 3 h. The solvent was evaporated under reduced pressure and the residue was diluted with cold water. The aqueous solution was basified by solid sodium carbonate and extracted with ethyl acetate. The combine organic layer was dried over anhydrous sodium sulfate, filtered and evaporated under reduced pressure to get crude compound. The crude compound was purified by silica gel chromatography (20% ethyl acetate in pet ether) to afford regioisomers as a mixture. The above mixture was separated by SFC purification to afford 2-chloro-6-fluoroquinoxaline (0.75 g, 44%) and 2-chloro-7-fluoroquinoxaline (0.65 g, 38%) as white solid. 2-chloro-6-fluoroquinoxaline: 1H NMR (400 MHz, DMSO-d6): delta ppm 8.75 (s, 1H), 8.14-8.11 (d, J=12 Hz, 1H), 7.67-7.64 (d, J=12 Hz, 1H), 7.59-7.54 (m, 1H); 19F NMR: delta ppm -107.15 (1F).
As the paragraph descriping shows that 55687-23-5 is playing an increasingly important role.
Reference£º
Patent; Bristol-Myers Squibb Company; Hiebert, Sheldon; Rajamani, Ramkumar; Sun, Li-Qiang; Mull, Eric; Gillis, Eric P.; Bowsher, Michael S.; Zhao, Qian; Meanwell, Nicholas A.; Renduchintala, Kishore V.; Sarkunam, Kandhasamy; Nagalakshmi, Pulicharla; Babu, P. V. K. Suresh; Scola, Paul Michael; US2013/115190; (2013); A1;,
Quinoxaline – Wikipedia
Quinoxaline | C8H6N2 | ChemSpider