This article describes an efficient method of bromination of organicsubstrates including aromatics, alkenes and alkynes with NH4VO3 as a catalyst and H2O2 as an oxidant agent using a non-toxic and easy-to-handle source of bromine, tetrabutylammonium bromide. The process was developed under mild reaction conditions and is an innovation from reported methods in aspects such as: i) short reaction times
本文介绍了一种有效的方法,该方法使用无毒且易于处理的溴,四丁基铵源,以NH 4 VO 3为催化剂,H 2 O 2为氧化剂,对包括芳族化合物,烯烃和炔烃在内的有机底物进行溴化。溴化物。该方法是在温和的反应条件下开发的,并且是从已报道方法的创新,例如:i)反应时间短,ii)在室温下工作的能力,iii)区域选择性和高产率。
Continuous Flow Synthesis of Terminal Epoxides from Ketones Using in Situ Generated Bromomethyl Lithium
作者:Timo von Keutz、David Cantillo、C. Oliver Kappe
DOI:10.1021/acs.orglett.9b04072
日期:2019.12.20
preparation of epoxidesfrom ketones has been developed. The method is based on the carefully controlled generation of (bromomethyl)lithium (LiCH2Br) from inexpensive CH2Br2 and MeLi in a continuous flow reactor. The reaction has shown excellent selectivity for a variety of substrates, including α-chloroketones, which typically fail under classic Corey-Chaykovsky conditions. This advantage has been used to develop
NaIO<sub>4</sub>-Mediated Selective Oxidative Halogenation of Alkenes and Aromatics Using Alkali Metal Halides
作者:Gajanan K. Dewkar、Srinivasarao V. Narina、Arumugam Sudalai
DOI:10.1021/ol0358206
日期:2003.11.1
[reaction: see text] NaIO(4) oxidizes alkali metal halides efficiently in aqueous medium to halogenate alkenes and aromatics and produce the corresponding halo derivatives in excellent regio and stereoselectivity. The system also demonstrates the asymmetric version of bromo hydroxylation using beta-cyclodextrin complexes, resulting in moderate ee.
Synthesis of brominated compounds. A convenient molybdenum- catalyzed procedure inspired by the mode of action of haloperoxidases
作者:Valeria Conte、Fulvio Di Furia、Stefano Moro
DOI:10.1016/0040-4039(96)01977-6
日期:1996.11
A two-phase () procedure for the synthesis of halogenated compounds has recently been developed. Such procedure mimics the mode of action of the enzymes haloperoxidases which contain vanadium in their active center. We have investigated the possibility to substitute vanadium with molybdenum. The molybdenum-based reactions show some advantages over the vanadium-based ones. In fact reaction times are