Metabolic Activation of PCBs to Quinones: Reactivity toward Nitrogen and Sulfur Nucleophiles and Influence of Superoxide Dismutase
作者:Anthony R. Amaro、Greg G. Oakley、Udo Bauer、H. Peter Spielmann、Larry W. Robertson
DOI:10.1021/tx950117e
日期:1996.1.1
groups are ortho or para to each other, oxidation to a quinone may be catalyzed by peroxidases present within the cell. In order to study the reactivity of PCB-derived quinones, selected chlorophenyl 1,2- and 1,4-benzoquinones were synthesized and characterized, including their reduction potentials against a saturated calomel electrode. Two quinones, 4-(4'-chlorophenyl)-1,2-, and 4-(3',4'-dichlorophenyl)-1
多氯联苯(PCB)可能会受到细胞色素P-450催化的羟基化作用,从而形成氯化二羟基联苯代谢物。当羟基彼此邻位或对位时,细胞内存在的过氧化物酶可催化氧化成醌。为了研究PCB衍生的醌的反应活性,合成并表征了所选的氯苯基1,2-和1,4-苯醌,包括它们对饱和甘汞电极的还原电位。通过将相应的二羟基联苯与2,3-氧化制得两个醌,即4-(4'-氯苯基)-1,2-和4-(3',4'-二氯苯基)-1,2-苯醌。二氯-5,6-二氰基-1,4-苯醌。通过Meerwein芳基化反应合成了六个1,4-苯醌:2-(2'-氯苯基)-1,4-,2-(3'-氯苯基)-1,4-,2-(4' -氯苯基)-1,4-,2-(2',5'-二氯苯基)-1,4-,2-(3',4'-二氯苯基)-1,4-和2-(3', 5'-二氯苯基)-1,4-苯醌。作为模型研究,在拟一级条件下确定了2-(4'-氯苯基)-1,4-苯醌对氮亲核试剂甘氨酸,