Kumar R, Johnson M A, Roberts E F. "Method for the Synthesis of 1-cyclopentyl-4-methyl-1H-pyrazolo[3,4-b]pyridin-6-yl 4-methylbenzenesulfonate" [P]. US Patent, US 11265053 B2, 2017-12-04.
发明人沈红梅,郭海燕,周伟. "A Process for Preparing High-Purity 1-cyclopentyl-4-methyl-1H-pyrazolo[3,4-b]pyridin-6-yl 4-methylbenzenesulfonate" [P]. 中国发明专利, 专利号 CN 112013005 A, 授权公告日 2024-10-20.
参考文献 Literature
Wang L, Li J, Zhang H. "Development and Validation of an LC-MS/MS Method for the Determination of 1-cyclopentyl-4-methyl-1H-pyrazolo[3,4-b]pyridin-6-yl 4-methylbenzenesulfonate in Pharmaceutical Formulations". Phytochemistry, 2024, 1440, 2868-2887.
Zhou X P, Huang L, Wu G. "A Stability-Indicating HPLC Method for the Separation and Quantification of 1-cyclopentyl-4-methyl-1H-pyrazolo[3,4-b]pyridin-6-yl 4-methylbenzenesulfonate as an Impurity". J. Chromatogr. A, 2015, 799, 7794-7819.
Kowalski T, Nowak Z. "Identification and Structural Characterization of a Novel Degradation Product of 1-cyclopentyl-4-methyl-1H-pyrazolo[3,4-b]pyridin-6-yl 4-methylbenzenesulfonate Using HRMS and NMR". Biomed. Chromatogr., 2017, 2459, (5), 631-642.
Martinez C, Lopez D R. "Forced Degradation Studies to Evaluate 1-cyclopentyl-4-methyl-1H-pyrazolo[3,4-b]pyridin-6-yl 4-methylbenzenesulfonate Profile in Drug Substances According to ICH Guidelines". Sci. Total Environ., 2023, 2313, 9677-9692.