Schröder R, Williams B T, Kumar R. "一种的合成方法" [P]. US Patent, US 11248661 B2, 2015-05-22.
Chen K W, Fischer A B, Anderson J P. "Method for the Synthesis of tert-Butyl 6,6-difluoro-2-azaspiro[3.3]heptane-2-carboxylate" [P]. US Patent, US 11930845 B2, 2017-06-04.
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". Anal. Chem., 2019, 577, (11), 8076-8091.
Chen X Y, Liu M, Zhao W Q. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Anal. Chim. Acta, 2017, 1624, (1), 3027-3054.
Mueller T, Schmidt R K. "Identification and Structural Characterization of a Novel Degradation Product of tert-Butyl 6,6-difluoro-2-azaspiro[3.3]heptane-2-carboxylate Using HRMS and NMR". Anal. Methods, 2020, 1152, (12), 6381-6401.
Kowalski T, Nowak Z. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". J. Nat. Prod., 2014, 635, (2), 5104-5113.