作者:Shang‐Ying P. King、Kenneth W. Sigvardson、John Dudzinski、George Torosian
DOI:10.1002/jps.2600810625
日期:1992.6
The degradation kinetics of moricizine hydrochloride (1) were examined over a pH range of 0.6 to 6.0 at an ionic strength of 0.3 and 60 degrees C. The disappearance of intact 1 was followed by a stability-indicating HPLC assay. The degradation products, which had approximate solubilities of less than 100 micrograms/mL, precipitated in aqueous solution. The precipitate was collected for HPLC analysis
在0.3至60摄氏度的离子强度下,在0.6至6.0的pH范围内检查了莫西利嗪盐酸盐(1)的降解动力学。完整1的消失随后是指示稳定性的HPLC测定。降解产物的溶解度大约低于100微克/ mL,沉淀在水溶液中。收集沉淀物用于HPLC分析和降解产物的鉴定。1的降解由乙酸盐和磷酸盐缓冲液催化,并且取决于pH,最小速率常数的pH位于2.8和3.2之间。在pH 0.6-2.0时,1通过酰胺水解降解,生成第一个氨基甲酸乙酯(10H-吩噻嗪-2-基)氨基甲酸酯(2),然后进一步平行氧化,得到乙基(3-oxo-3H-吩噻嗪) -2-基氨基甲酸酯(3),(10H-吩噻嗪-2-基)氨基甲酸乙酯S-氧化物(4)和二乙基(3,10'-bi-10H-吩噻嗪-2,2'-二基)双(氨基甲酸酯)(5)酰胺水解产物。在pH 2.2-6.0时,1通过逆曼尼希反应降解,从而形成逆曼尼希产物氨基甲酸乙酯[10-(1-氧代-2-丙烯