The Influence of the p-Alkyl Substituent on the Isomerization of o-Quinones to p-Quinone Methides: Potential Bioactivation Mechanism for Catechols
作者:Suzanne L. Iverson、Li Qing Hu、Vesna Vukomanovic、Judy L. Bolton
DOI:10.1021/tx00046a007
日期:1995.6
glutathione produced only o-quinone glutathione conjugates. However, if the trapping agent (GSH) was added after an initial incubation time, both o-quinone and p-quinone methide GSH conjugates were observed. The results indicate that extended pi-conjugation at the para position enhances the rate of isomerization of the o-quinone to the quinone methide. Thus the half-life of the o-quinones decreased in the following
以前,我们已经发现,肝癌黄樟脑(1-烯丙基-3,4-(亚甲基二氧基)苯)存在另外的生物活化途径,这可能有助于其毒性作用:亚甲基二氧基环的初始O-脱烷基化,形成儿茶酚,羟基chavicol(HC,1-allyl-3,4-dihydroxybenzene),2-电子氧化为邻醌(4-allyl-3,5-cyclohexadien-1,2-dione)和异构化,形成更具亲电性的p -苯醌甲基化物(2-羟基-4-烯丙基-2,5-环己二烯-1-酮)[Bolton,JL,Acay,NM,&Vukomanovic,V.(1994)。Res。毒药。7,443-450]。在本研究中,我们探讨了在4位改变pi共轭对最初形成的邻醌向QM异构化的速率以及由4-丙基邻苯二酚形成的醌类化合物的反应性的影响(1), 2,3-二羟基-5,6,7,8-四氢萘(2)和4-肉桂基邻苯二酚(3)。我们选择性地将邻苯二酚氧化为相应的