Roberts E F, Mueller T, Schröder R. "Method for the Synthesis of Tert-butyl 8-oxo-3-azaspiro[5.5]Undecane-3-carboxylate" [P]. US Patent, US 10164284 B2, 2018-07-28.
Fischer A B, Patel M V, Stevens L M. "A Process for Preparing High-Purity Tert-butyl 8-oxo-3-azaspiro[5.5]Undecane-3-carboxylate" [P]. US Patent, US 9752570 B2, 2024-03-24.
参考文献 Literature
Chen X Y, Liu M, Zhao W Q. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Anal. Chim. Acta, 2015, 2357, (10), 2284-2311.
O'Brien K, Kennedy M L. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Molecules, 2019, 1068, 850-873.
Martinez C, Lopez D R. "Identification and Structural Characterization of a Novel Degradation Product of Tert-butyl 8-oxo-3-azaspiro[5.5]Undecane-3-carboxylate Using HRMS and NMR". J. Chromatogr. A, 2022, 526, 1143-1150.