Reference of 816-27-3, In the chemical reaction process, reaction time, type of solvent, can easily affect the result of the reaction, thereby determining the yield and properties of the reaction product. An updated downstream synthesis route of 816-27-3 as follows.
To a suspension of 3-methoxy-benzene-1,2-diamine sulfate, Example 25(b), (2.36 g, 10 mmol) in EtOH (15 mL) and H2O (1 mL) was added NaHCO3 (1.68 g, 20 mmol, J T Baker). When gas evolution was complete, ethoxy-imino-acetic acid ethyl ester (1.6 g, 11 mmol, prepared according to J. Chem. Soc. Perkin. Trans. 1, 1999, 1789) was added and the mixture was stirred at room temperature for 16 h. The reaction was diluted with sat. aq. NaHCO3 and extracted with 25% i-PrOH(CHCl3 (5¡Á). The combined organic layers were dried over Na2SO4, filtered, and concentrated in vacuo. Purification by silica gel column chromatography (gradient: 0-5% MeOH/CH2Cl2) afforded 3-amino-8-methoxy-1H-quinoxalin-2-one as a light-brown powder [MS (ESI, pos. ion) m/z: 192 (M+1)] and 3-amino-5-methoxy-1H-quinoxalin-2-one as a light-brown powder [MS (ESI, pos. ion) m/z: 192 (M+1)].
According to the analysis of related databases, 816-27-3, the application of this compound in the production field has become more and more popular.
Reference:
Patent; Wang, Hui-Ling; Balan, Chenera; Doherty, Elizabeth M.; Falsey, James R.; Gore, Vijay Keshav; Katon, Jodie; Norman, Mark H.; US2005/176726; (2005); A1;,
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