Electrochemical oxidative cyclization of olefinic carbonyls with diselenides
作者:Zhipeng Guan、Yunkun Wang、Huamin Wang、Yange Huang、Siyuan Wang、Hongding Tang、Heng Zhang、Aiwen Lei
DOI:10.1039/c9gc02665g
日期:——
The tandem cyclization of olefinic carbonyls with easily accessible diselenides facilitated by electrochemical oxidation has been successfully developed, which provides an environmentally friendly method for the construction of C–Se and C–O bonds simultaneously. A series of seleno dihydrofurans and seleno oxazolines, bearing fragile heterocycles, subtle C–I bonds and supernumerary vinyl groups, were
method for CF3-containing oxazolines via trifluoromethylation of allylamides by using Togni reagent in the presence of alkali metal iodides, which play a key role in selective production of the desired oxazoline. The reaction did not proceed efficiently with copper catalysts commonly used for oxytrifluoromethylations. Our method afforded a wide variety of CF3-containing oxazolines, which are potential candidates
Toward a General Protocol for Catalytic Oxidative Transformations Using Electrochemically Generated Hypervalent Iodine Species
作者:Mohamed Elsherbini、Wesley J. Moran
DOI:10.1021/acs.joc.2c02309
日期:2023.2.3
addition, no added electrolytic salts are needed in this process. The developed method has been validated using two different hypervalent iodine-mediated transformations: (i) the oxidative cyclization of N-allylic and N-homoallylic amides to the corresponding dihydrooxazole and dihydro-1,3-oxazine derivatives, respectively, and (ii) the α-tosyloxylation of ketones. Both reactions proceeded smoothly under
已经开发了一种用于由高价碘试剂介导的氧化转化的简单催化电合成方案。在该协议中,电力驱动碘 (I)/碘 (III) 催化循环,使原位产生的高价碘物种能够进行催化,从而消除化学氧化剂和与其作用方式相关的不可避免的化学废物。此外,在此过程中不需要添加电解质盐。所开发的方法已使用两种不同的高价碘介导的转化进行了验证:(i)N-烯丙基和N的氧化环化- 高烯丙基酰胺分别生成相应的二氢恶唑和二氢-1,3-恶嗪衍生物,以及 (ii) 酮的 α-甲苯磺酰氧基化。两个反应在开发的催化电合成条件下顺利进行,无需重新优化,具有广泛的底物范围和优异的官能团耐受性。此外,可以轻松实现克级放大和催化剂回收,从而保持工艺的高效率。
The Copper-Catalyzed <i>N</i>-Arylation of Indoles
作者:Jon C. Antilla、Artis Klapars、Stephen L. Buchwald
DOI:10.1021/ja027433h
日期:2002.10.1
A general method for the N-arylation of indoles using catalysts derived from Cul and trans-1,2-cyclohexanediamine (1a), trans-N,N'-dimethyl-1,2-cyclohexanediamine (2a), or N,N'-dimethyl-ethylenediamine (3) is reported. N-Arylindoles can be produced in high yield from the coupling of an aryl iodide or aryl bromide with a variety of indoles.
ROMPGEL Scavengers: A High-Loading Supported Anhydride for Sequestering Amines and Hydrazines
作者:Thomas Arnauld、Anthony G. M. Barrett、Susan M. Cramp、Richard S. Roberts、Frederic J. Zécri
DOI:10.1021/ol006191s
日期:2000.8.1
[GRAPHICS]A versatile method for sequestering excess amines and hydrazines is reported using a high loading ROMPGEL anhydride polymer.