发明人徐明华,马晓峰,罗永刚. "Method for the Synthesis of Methyl 2-oxo-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazine-7-carboxylate" [P]. 中国发明专利, 专利号 CN 110445019 B, 授权公告日 2022-10-09.
发明人周伟,胡光,张德明. "A Process for Preparing High-Purity Methyl 2-oxo-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazine-7-carboxylate" [P]. 中国发明专利, 专利号 CN 113323583 A, 授权公告日 2022-08-03.
参考文献 Literature
Kim S H, Park J Y. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Talanta, 2012, 158, (6), 2671-2695.
Fischer P, Wagner E. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Environ. Sci. Technol., 2019, 359, 6241-6271.
Martinez C, Lopez D R. "Identification and Structural Characterization of a Novel Degradation Product of Methyl 2-oxo-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazine-7-carboxylate Using HRMS and NMR". Anal. Chem., 2012, 723, (1), 967-992.