One-step synthesis of substituted isobenzofuran-1(3H)-ones and isobenzofuran-1,3-diones from indane derivatives in subcritical media
摘要:
Molecular oxygen is one of the most attractive oxidants in organic synthesis because it is highly soluble in subcritical water. In this study, indane derivatives were oxidized to the corresponding isobenzofuran-1(3H)-one with molecular oxygen and isobenzofuran-1,3-dione with a mixture of molecular oxygen and H2O2 in subcritical water. This paper describes a simple, economic, environmentally benign,and general procedure that can be used for the synthesis of substituted isobenzofuran-1(3H)-ones and isobenzofuran-1,3-diones in only one step and without catalyst.
Stereoselective Coupling of Prochiral Radicals with a Chiral <i>C</i><sub>2</sub>-Symmetric Nitroxide
作者:Rebecca Braslau、Neeta Naik、Hendrik Zipse
DOI:10.1021/ja000520u
日期:2000.9.1
The coupling reaction between a chiral C2-symmetric nitroxide, trans-2,5-dimethyl-2,5-diphenylpyrrolidin-1-oxyl (DPPO; 1), and a series of stabilized secondary prochiral radicals was studied to determine the factors that affect stereoselectivity. Both steric and electronic perturbations on the selectivity by the substituents of the prochiral radical were observed. The effects of temperature, solvent
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。
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
Facile one-pot synthesis of α-bromoketones from olefins using bromide/bromate couple as a nonhazardous brominating agent
作者:Rajendra D. Patil、Girdhar Joshi、Subbarayappa Adimurthy、Brindaban C. Ranu
DOI:10.1016/j.tetlet.2009.03.047
日期:2009.5
A new method for the preparation of α-bromoketones from olefins using bromide/bromate couple as a nonhazardous brominating agent has been developed. Several α-bromoketones were successfully prepared from a variety of olefins by this method. This procedure is an alternative to conventional molecular bromine.