Nonmetal-Catalyzed Iodination of Arenes with Iodide and Hydrogen Peroxide
作者:Jernej Iskra、Stojan Stavber、Marko Zupan
DOI:10.1055/s-2004-829136
日期:——
lecular halogens for direct halogenation has drawbacks in the difficult and dangerous handling of chlorine and bro- mine, while iodine is less reactive. Nature has solved this problem by evolving haloperoxidases, enzymes that oxi- dize halide salts into reactive hypohalous derivatives. 3 Its counterpart in chemistry, named oxidative halogenation, has been utilized for iodination with a plethora of catalysts
在强酸存在下,用 1 当量 KI 和 2 当量 30% 过氧化氢的 MeOH 溶液对芳烃进行氧化碘化。各种取代的苯甲醚、苯酚和苯胺以及均三甲苯和尿嘧啶的反应具有选择性且有效,分离的卤代芳烃分子的收率非常高。卤代有机分子是药物和农业化学中的重要化合物,1 并且它们是化学合成中的重要合成中间体,特别是对于 CC 偶联反应。2 使用分子卤素进行直接卤化的缺点是氯和溴的处理困难且危险,而碘的反应性较低。大自然通过进化卤过氧化物酶解决了这个问题,将卤化物盐氧化成反应性次卤衍生物的酶。3 其在化学中的对应物称为氧化卤化,已被用于与大量催化剂和氧化剂以及分子碘或更少的碘化反应
Development of a fluorogenic small substrate for dipeptidyl peptidase-4
non-fluorescent dipeptide analogue H-Gly-Pro-1 for the use as a fluorogenicsubstrate for dipeptidyl peptidase-4 (DPP-4). The progress of the enzymatic hydrolysis of H-Gly-Pro-1 with DPP-4 was monitored by fluorometric determination of 1 released into the reaction medium. The results suggest that 1 could be used as fluorophore in OFF-ON-type fluorogenic probes.