Involving Single-Atom Silver(0) in Selective Dehalogenation by AgF under Visible-Light Irradiation
摘要:
The dehalogenation-arylation and the hydro-dehalogenation of various types of organic halides are selectively realized using AgF and visible light without any organic additives under mild conditions. Single-atom silver(0) (denoted as SAAg) serves as the catalytically active center, and the TOF of SAAg reaches 6000 h(-1). This elusive activity of Ag is beyond that expected from its ionic, nano, or bulk forms.
Abstract Monosubstituted acetylenes were iodinated to form iodoacetylenes under simple conditions. Reaction of aryl acetylenes with molecular iodine in the presence of 4‐dimethylaminopyridine (DMAP) gave the desired products in good to excellent yields. Iodination of aryl acetylenicketones using K2CO3 as base was also described.
Efficient synthesis of 1-iodoalkynes <i>via</i> Al<sub>2</sub>O<sub>3</sub> mediated reaction of terminal alkynes and <i>N</i>-iodosuccinimide
作者:Ming Yao、Jingjing Zhang、Sen Yang、Hangxing Xiong、Li Li、E. Liu、Hong Shi
DOI:10.1039/d0ra00251h
日期:——
Iodination of terminalalkynes using N-iodosuccinimide (NIS) in the presence of γ-Al2O3 was developed to afford 1-iodoalkynes with good to excellent yields (up to 99%). This described approach featured excellent chemoselectivity, good functional group tolerance, and utilization of an inexpensive catalyst.
开发了在 γ-Al 2 O 3存在下使用N-碘代琥珀酰亚胺 (NIS) 对末端炔进行碘化,以提供良好至优异产率(高达 99%)的 1-碘炔。这种方法具有优异的化学选择性、良好的官能团耐受性以及使用廉价催化剂的特点。
Tuning radical reactivity using iodine in oxidative C(sp<sup>3</sup>)–H/C(sp)–H cross-coupling: an easy way toward the synthesis of furans and indolizines
作者:Shan Tang、Kun Liu、Yue Long、Xiaotian Qi、Yu Lan、Aiwen Lei
DOI:10.1039/c5cc01825k
日期:——
Molecular iodine was found to be an effective redox catalyst for the oxidative cross-coupling of carbonyl compounds with terminal alkynes.
分子碘被发现是一种有效的氧化还原催化剂,可用于羰基化合物与末端炔烃的氧化交叉偶联反应。
Multicomponent Aqueous Synthesis of Iodo-1,2,3-triazoles: Single-Step Models for Dual Modification of Free Peptide and Radioactive Iodo Labeling
direct modification of bioactive molecules in water. Through the combination of water‐compatible oxidative iodination and the copper‐catalyzed alkyne–azide cycloaddition reaction, a novel copper‐catalyzed aqueous multicomponent synthetic method for the preparation of 5‐iodo‐1,2,3‐triazoles has been developed. The method is highly effective and selective for substrates including biologically relevant
Hypervalent Iodine Mediated Chemoselective Iodination of Alkynes
作者:Yan Liu、Daya Huang、Ju Huang、Keiji Maruoka
DOI:10.1021/acs.joc.7b01555
日期:2017.11.17
herein are practical approaches for the chemoselective mono-, di-, and tri-iodination of alkynes based on efficient oxidative iodinationscatalyzed by hypervalent iodine reagents. The reaction conditions were systematically optimized by altering the iodine source and/or the hypervalent iodine reagent system. The tetrabutylammonium iodide (TBAI)/(diacetoxyiodo)benzene (PIDA) system is specific for monoiodination