这里报道的是针对Achmatowicz重排(AchR)的环保型催化(KBr / oxone)和无溶剂方案的开发。与所有以前的方法不同的是,使用色谱氧化铝(Al 2 O 3)可使AchR在不存在任何有机溶剂的情况下顺利进行,因此可极大地促进后续的后处理和纯化,并且对环境的影响最小。重要的是,该协议允许按比例放大(从毫克到克),回收Al 2 O 3以及与其他反应按一锅顺序方式进行整合。
catalytic methods for the oxidative furan-recyclizations remain scarcely investigated. Given this, we report a means of manganese-catalyzed oxidations of furan with low loading, achieving the Achmatowiczrearrangement in the presence of hydrogen peroxide as an environmentally benign oxidant under mild conditions with wide functional group compatibility.
A solvent-free catalytic protocol for the Achmatowicz rearrangement
作者:Guodong Zhao、Rongbiao Tong
DOI:10.1039/c8gc03030h
日期:——
Reported here is the development of an environmentally friendly catalytic (KBr/oxone) and solvent-free protocol for the Achmatowiczrearrangement (AchR). Different from all previous methods is that the use of chromatographic alumina (Al2O3) allows AchR to proceed smoothly in the absence of any organic solvent and therefore considerably facilitates the subsequent workup and purification with minimal
这里报道的是针对Achmatowicz重排(AchR)的环保型催化(KBr / oxone)和无溶剂方案的开发。与所有以前的方法不同的是,使用色谱氧化铝(Al 2 O 3)可使AchR在不存在任何有机溶剂的情况下顺利进行,因此可极大地促进后续的后处理和纯化,并且对环境的影响最小。重要的是,该协议允许按比例放大(从毫克到克),回收Al 2 O 3以及与其他反应按一锅顺序方式进行整合。
Titanium Silicalite 1 (TS-1) Catalyzed Oxidative Transformations of Furan Derivatives with Hydrogen Peroxide
作者:Joos Wahlen、Bart Moens、Dirk E. De Vos、Paul L. Alsters、Pierre A. Jacobs
DOI:10.1002/adsc.200303185
日期:2004.2
The oxidation of furan derivatives with titaniumsilicalite 1 (TS-1) and hydrogen peroxide is described. Oxidation products are identified and possible reaction pathways are discussed. It is shown that the oxidation of these compounds occurs via epoxidation of one of the furan double bonds. The initially formed epoxides immediately undergo rearrangement, furans yielding unsaturated 1,4-dicarbonyl compounds
A new set of completely green methods utilising air, light, water and spirulina to transform readily accessible furan substrates into a diverse range of synthetically useful polyoxygenated motifs commonly found in natural products is presented herein.
作者:Brian M. Adger、Collette Barrett、Joseph Brennan、M. Anthony McKervey、R. W. Murray
DOI:10.1039/c39910001553
日期:——
Dimethyldioxirane reacts rapidly at room temperature in acetone with a variety of furans, furnishing in high yield products of oxidative ring opening and, with 2-furanmethanol, 2H-pyran-3(6H)-one via subsequent ring closure.