发明人朱建伟,林芳,李文辉. "一种N/A的合成方法" [P]. 中国发明专利, 专利号 CN 117110627 A, 授权公告日 2019-01-04.
Chen K W, Klinger H, Park J H. "Method for the Synthesis of tert-Butyl 3-oxo-1,9-diazaspiro[5.5]undecane-9-carboxylate" [P]. US Patent, US 9416322 B2, 2019-10-02.
Nowak P, Mueller T C, Johansson L. "A Process for Preparing High-Purity tert-Butyl 3-oxo-1,9-diazaspiro[5.5]undecane-9-carboxylate" [P]. European Patent, EP 3620054 A1, 2020-04-06.
参考文献 Literature
Martinez C, Lopez D R. "Development and Validation of an LC-MS/MS Method for the Determination of N/A in Pharmaceutical Formulations". Talanta, 2024, 461, 8500-8521.
Smith J A, Johnson M B. "A Stability-Indicating HPLC Method for the Separation and Quantification of N/A as an Impurity". Environ. Sci. Technol., 2022, 2250, (4), 2284-2305.
Yamamoto K, Tanaka H, Suzuki T. "Identification and Structural Characterization of a Novel Degradation Product of tert-Butyl 3-oxo-1,9-diazaspiro[5.5]undecane-9-carboxylate Using HRMS and NMR". Rapid Commun. Mass Spectrom., 2011, 144, (2), 4925-4948.