Facilitated Intramolecular Conjugate Addition of Amides of 3-(3‘,6‘-Dioxo-2‘,4‘-dimethyl-1‘,4‘-cyclohexadienyl)-3,3-dimethylpropionic Acid. 2. Kinetics of Degradation
作者:Michalis G. Nicolaou、Janet L. Wolfe、Richard L. Schowen、Ronald T. Borchardt
DOI:10.1021/jo961069l
日期:1996.1.1
the intramolecular 1,2- or 1,4- conjugate addition of the amide nitrogen to the quinone ring. This conjugate addition was found to be specific base-catalyzed and independent of the para substituent on the aromatic ring of the amine. The predominant route of degradation yielded a five-membered ring spirolactam. By altering the nature of the amine component of the amide, these degradation reactions were
3-(3',6'-dioxo-2',4'-二甲基-1',4'-环己二烯基)-3,3-二甲基丙酸(Qa)[Qop(aj)]的酰胺的化学稳定性研究为了确定该氧化还原敏感系统作为有机合成中潜在的前药促发基团或氧化还原敏感保护基的实用性,进行了研究。这项研究表明,苯胺衍生物[Qop(ad)]的醌丙酰胺在中等酸性条件下(pH 4.5-6.0)经历了快速降解,从而产生了分子内1,2-或1,4-共轭物添加的降解产物。酰胺氮连接至醌环。发现该共轭加成是特定的碱催化的并且独立于胺的芳环上的对取代基。降解的主要途径产生了五元环螺内酰胺。通过改变酰胺的胺成分的性质,防止了这些降解反应。发现Qa的酰胺比苯胺型[Qop(ej)]的酰胺更稳定,因此被提议作为该潜在的对氧化还原敏感的前药系统和对胺和醇的氧化还原敏感保护基的更合适的候选物。在有机合成中。