Reactions of Glutathione with Carcinogenic Esters of <i>N</i>-Arylhydroxamic Acids
作者:Michael Novak、Jing Lin
DOI:10.1021/ja9534563
日期:1996.1.1
this study (4 from 1a, 11 and 12 from 1b) are not derivedfrom nitrenium ion trapping. They arise from GS- trapping of the quinol imines 8a and 8b, which are the initial products of trapping of 7a and 7b by H2O. This reaction is very efficient at physiological GS- concentrations and could lead to significant GSH depletion in vivo. Although it has been known for some time that quinol imines such as
Selective Trapping of N-Acetyl-N-(4-biphenylyl)nitrenium and N-Acetyl-N-(2-fluorenyl)nitrenium Ions by 2'-Deoxyguanosine in Aqueous Solution
作者:Michael Novak、Sonya A. Kennedy
DOI:10.1021/ja00106a083
日期:1995.1
Reactivity and selectivity of nitrenium ions derived from ester derivatives of carcinogenic N-(4-biphenylyl)hydroxylamine and the corresponding hydroxamic acid
作者:Michael Novak、Mary Jo Kahley、Emily Eiger、John S. Helmick、Hope E. Peters
DOI:10.1021/ja00074a010
日期:1993.10
N-Acetyl-N-(sulfonatooxy)-4-aminobiphenyl (1a) and N-(4-biphenylyl)-O-pivaloylhydroxylamine (1c) decompose in 5% CH 3 CN/H 2 O, μ=0.5 M, at 20 o C via rate-limiting N-O bond heterolysis to generate the nitreniumion interediates 2a and 2b, respectively. Addition of Cl - (≤0.5 M) of N 3 - (≤0.05 M) causes a marked decrease in the yields of all hydrolysis products derived from 1a and 1c, except the rearrangement
N-乙酰基-N-(磺基氧基)-4-氨基联苯 (1a) 和 N-(4-联苯基)-O-新戊酰羟胺 (1c) 在 5% CH 3 CN/H 2 O 中分解,μ=0.5 M,在 20 o C 通过限速 NO 键异解作用分别生成氮烯离子中间体 2a 和 2b。添加 Cl - (≤0.5 M) 和 N 3 - (≤0.05 M) 导致来自 1a 和 1c 的所有水解产物的产率显着降低,除了重排产物 10a 和 11,水解速率没有任何变化常数