Lee S K, O'Brien P Q, Kumar R. "一种的合成方法" [P]. US Patent, US 11611519 B2, 2017-08-14.
Williams B T, Mueller T, Chen K W. "Method for the Synthesis of Methyl 6-cyclopropyl-1-(2-(isopropylamino)-2-oxoethyl)-3-methyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylate" [P]. US Patent, US 9701482 B2, 2021-03-02.
Thompson G K, Klinger H, Chen K W. "A Process for Preparing High-Purity Methyl 6-cyclopropyl-1-(2-(isopropylamino)-2-oxoethyl)-3-methyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylate" [P]. US Patent, US 10393795 B2, 2015-09-06.
参考文献 Literature
Xu M, Hu Y, Zhou D. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Talanta, 2013, 1953, (6), 8341-8367.
Wang L, Li J, Zhang H. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Phytochemistry, 2013, 1129, (8), 5864-5879.
Garcia M, Rodriguez P. "Identification and Structural Characterization of a Novel Degradation Product of Methyl 6-cyclopropyl-1-(2-(isopropylamino)-2-oxoethyl)-3-methyl-1H-pyrazolo[3,4-b]pyridine-4-carboxylate Using HRMS and NMR". J. Pharm. Biomed. Anal., 2021, 1473, (5), 7653-7679.