Lee S K, Klinger H, Thompson G K. "Method for the Synthesis of 1-methyl-1,4-diazaspiro[5.5]undecane dihydrochloride" [P]. US Patent, US 10063285 B2, 2019-12-07.
Björnsson E, Johansson L, Kowalski A. "A Process for Preparing High-Purity 1-methyl-1,4-diazaspiro[5.5]undecane dihydrochloride" [P]. European Patent, EP 3737917 A1, 2016-06-14.
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 1-methyl-1,4-diazaspiro[5.5]undecane dihydrochloride in Pharmaceutical Formulations". Anal. Chem., 2020, 1589, (10), 9115-9124.
Jensen P, Larsen A M, Olsen K. "A Stability-Indicating HPLC Method for the Separation and Quantification of 1-methyl-1,4-diazaspiro[5.5]undecane dihydrochloride as an Impurity". Chemosphere, 2020, 1886, (3), 7602-7629.
Mueller T, Schmidt R K. "Identification and Structural Characterization of a Novel Degradation Product of 1-methyl-1,4-diazaspiro[5.5]undecane dihydrochloride Using HRMS and NMR". J. Pharm. Biomed. Anal., 2011, 1723, 6327-6341.