188614-01-9 A common heterocyclic compound, 188614-01-9,Methyl 3-oxo-3,4-dihydro-2H-1,4-benzothiazine-6-carboxylate, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route.
A. 3-Oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-carboxylic acid. To a solution of 3-oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-carboxylic acid methyl ester (1.5 g, 6,7 mmol) in a THF/H2O mixture (1:1, 63 mL) was added 4 N LiOH (8.0 mL, 32 mmol) and the resulting solution was stirred at RT for 24 h. The solution was partially concentrated and diluted with H2O (50 mL). The solution was acidified using concentrated HCl and a solid precipitated. The solid was collected via filtration, washed with H2O and dried in vacuo to provide 0.79 g (60%) of the title compound as a white solid. MS (ESI): exact mass calculated for C9H7NO3S, 209.01; m/z found, 210.2 [M+H]+. 1H NMR (500 MHz, CD3OD): 7.65-7.61 (m, 2H), 7.40 (d, J=8.1, 1H), 3.48 (s, 2H)., 188614-01-9
This compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,188614-01-9,Methyl 3-oxo-3,4-dihydro-2H-1,4-benzothiazine-6-carboxylate,its application will become more common.
Reference£º
Patent; Allison, Brett D.; Gomez, Laurent; Grice, Cheryl A.; Hack, Michael D.; Morrow, Brian J.; Motley, S. Timothy; Santillan, Alejandro; Shaw, Karen J.; Schwarz, Kimberly L.; Tang, Liu Y.; Venkatesan, Hariharan; Wiener, John J. M.; US2006/223810; (2006); A1;,
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