A concerted metallophotoredox catalysis has been realized for the efficient decarboxylative functionalization of α,β-unsaturated carboxylic acids with aryl iodides in the presence of perylene bisimide dye to afford 1,2-diketones.
Unexpected reactivity of diaryl α-diketones with thiazolium carbenes: discovery of a novel multicomponent reaction for the facile synthesis of 1,4-thiazin-3-ones
作者:Valerio Bertolasi、Olga Bortolini、Adelaide Donvito、Giancarlo Fantin、Marco Fogagnolo、Pier Paolo Giovannini、Alessandro Massi、Salvatore Pacifico
DOI:10.1039/c2ob25928a
日期:——
Diarylα-diketones do not undergo polarity reversal in the presence of (benzo)thiazolium carbenes but are engaged in a novel multicomponent reaction with water to efficiently give medicinally relevant 1,4-thiazin-3-one heterocycles. Three different sets of conditions have been optimized to furnish the title compounds in fair to excellent yields depending on the electronic properties of α-diketone aromatic
Tandem and chemoselective synthesis of benzil derivatives from styrene and arene diazonium salts
作者:Vilas G. Jadhav、Sachin A. Sarode、Jayashree M. Nagarkar
DOI:10.1016/j.tetlet.2017.03.076
日期:2017.5
A facile and practically applied protocol for synthesis of benzil derivatives using styrene and arene diazonium salts is reported. Pd(OAc)2/SeO2 catalyticsystem was found to be efficient for chemoselective synthesis of benzil. Selenium dioxide works well as an oxidant under milder reaction conditions. Moderate to very good yields of the desired products were obtained.
据报道,使用苯乙烯和芳烃重氮盐合成苯衍生物的简便实用方法。发现Pd(OAc)2 / SeO 2催化体系对于苯的化学选择性合成非常有效。在较温和的反应条件下,二氧化硒作为氧化剂很好地起作用。获得了所需产物的中等至非常高的产率。
One-Pot Synthesis of Unsymmetrical Benzils by Oxidative Coupling Using Selenium Dioxide and p-Toluenesulfonic Acid Monohydrate
作者:Md. Rumum Rohman、Icydora Kharkongor、Mantu Rajbangshi、Hormi Mecadon、Badaker M. Laloo、Priti R. Sahu、Iadeishisha Kharbangar、Bekington Myrboh
DOI:10.1002/ejoc.201101012
日期:2012.1
The oxidative coupling of the α-carbon atom of aromatic ketones with unactivated arenes in the presence of seleniumdioxide and p-toluenesulfonic acid monohydrate is described. A number of unsymmetrical benzils have been prepared in good yields (38–75 %) with high regioselectivity. The generality and functional tolerance of this new protocol is demonstrated. The mechanistic pathway for the oxidative
Self-Assembly of a Halogenated Molecule on Oxide-Passivated Cu(110)
作者:Mohamed El Garah、Josh Lipton-Duffin、Jennifer M. MacLeod、Rico Gutzler、Frank Palmino、Vincent Luzet、Frédéric Chérioux、Federico Rosei
DOI:10.1002/asia.201300283
日期:2013.8
The supramolecular self‐assembly of brominated molecules was investigated and compared on Cu(110) and Cu(110)O(2×1) surfaces under ultrahigh vacuum. By using scanning tunnelling microscopy, we show that brominated molecules form a disordered structure on Cu(110), whereas a well‐ordered supramolecular network is observed on the Cu(110)O(2×1) surface. The different adsorption behaviors of these two