作者:Yong Jai Lee、Janice Padula、Hyuk-Koo Lee
DOI:10.1002/jps.2600770116
日期:1988.1
and mechanisms of etodolac (1; 1,8-diethyl-1,3,4,9-tetrahydropyrano[3,4-b]-indole-1-acetic acid) decomposition, as a function of pH and temperature, were investigated. Three main degradation products derived from 1 are identified as 7-ethyl-2-(1-methylenepropyl)-1H-indole-3-ethanol (2), the decarboxylated product of etodolac (3), and 7-ethyltryptophol (4). The main pathway for the degradation of 1
依托度酸(1; 1,8-二乙基-1,3,4,9-四氢吡喃并[3,4-b]-吲哚-1-乙酸)的分解程度和机理是pH和温度的函数调查。衍生自1的三种主要降解产物被鉴定为7-乙基-2-(1-亚甲基丙基)-1H-吲哚-3-乙醇(2),依托度酸的脱羧产物(3)和7-乙基色酚(4)。降解1的主要途径是连续的一级动力学:在平衡3 ---- 4中为1 ---- 2。对于本研究中的任何一种缓冲液,均未观察到对1降解有明显的缓冲作用。速率-pH曲线在酸性(kH)和中性(k'H)pH区域表现出特定的酸催化作用,在pH 4.65处的拐点对应于pKa值。从Arrhenius曲线图中,kH和k'的活化能(Ea)发现H分别为26和24kcal / mol。较小的活化正熵(δS)表明单分子分解机理有利于1的分解反应。