Synthesis and Decomposition of an Ester Derivative of the Procarcinogen and Promutagen, PhIP, 2-Amino-1-methyl-6-phenyl-1<i>H</i>-imidazo[4,5-<i>b</i>]pyridine: Unusual Nitrenium Ion Chemistry
作者:Thach-Mien Nguyen、Michael Novak
DOI:10.1021/jo070306p
日期:2007.6.1
stable at −40 °C. It decomposed rapidly in aqueous solution, but its conjugate acid, 1bH+, is not reactive. The nitrenium ion, 2, was trapped by N3- to form the unusual tetrazole adduct, 16. In the absence of N3-, the expected hydration products of 2 were not detected, but the reduction product, 12, was detected. Although such products are often taken as evidence of triplet nitrenium ions, the efficient
食物衍生的杂环胺(HCA)致癌物2-氨基-1-甲基-6-苯基-1 H-咪唑并[4,5- b ]吡啶PhIP通常在烤制过程中形成的HCA浓度最高炸肉和鱼。尽管它被认为是因接触HCA而导致人类癌症风险的重要因素,但是大概与DNA反应以引发癌变的PhIP代谢产物的化学作用仅引起了人们的粗略关注。我们合成了酯衍生物N-新戊氧基-2-氨基-1-甲基-6-苯基-1 H-咪唑并[4,5- b ]吡啶1b,并研究了其在水溶液中的化学性质。虽然1b由于太不稳定而无法分离,我们可以在-40°C的溶剂DMF- d 7中通过NMR方法对其进行表征。在水溶液中迅速分解,但其共轭酸1bH +,没有反应。的nitrenium离子,2,被困用N 3 -以形成异常的四唑加成物,16。在不存在N个3 - ,预期水化产物2未检测到,但还原产物,12,进行检测。虽然这样的产品通常作为三重态nitrenium离子的证据,高效捕集2乘N