发明人杨光,林芳,郑宇鹏. "Method for the Synthesis of Ethyl 4-oxo-4H-pyrido[3,4-d][1,3]oxazine-2-carboxylate" [P]. 中国发明专利, 专利号 CN 110170262 B, 授权公告日 2023-02-21.
Mueller T C, Johansson L, Kowalski A. "A Process for Preparing High-Purity Ethyl 4-oxo-4H-pyrido[3,4-d][1,3]oxazine-2-carboxylate" [P]. European Patent, EP 3824623 A1, 2024-05-20.
参考文献 Literature
Mueller T, Schmidt R K. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Chemosphere, 2013, 1009, 9219-9236.
Yamamoto K, Tanaka H, Suzuki T. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Chromatographia, 2012, 1580, 729-744.
Wang L, Li J, Zhang H. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 4-oxo-4H-pyrido[3,4-d][1,3]oxazine-2-carboxylate Using HRMS and NMR". Biomed. Chromatogr., 2022, 950, (9), 1447-1455.