随着对绿色化学和可持续发展的日益关注,人们对寻找更绿色的有机合成方法和来源产生了浓厚的兴趣。然而,大多数有机转化都不可避免地涉及有毒添加剂或溶剂。在此,我们首先报道了直接利用太阳能、空气作为氧化剂和水作为溶剂选择性裂解 C 的组合。C 芳基烯烃中的双键。各种 α-甲基苯乙烯、二芳基烯烃以及末端苯乙烯在这种绿色和可持续的策略中具有良好的耐受性,并以令人满意的收率提供所需的羰基产品。与多相催化一样,这种均相催化体系也可以重复使用,重复3次后仍能保持良好的活性。机理研究表明,O 2 ˙ -和1 O 2都参与了反应。基于这些结果,提出了两种可能的机制,包括电子转移途径和能量转移途径。
Regiodivergent DH or HD Addition to Alkenes: Deuterohydrogenation versus Hydrodeuterogenation
作者:Luomo Li、Gerhard Hilt
DOI:10.1021/acs.orglett.0c00213
日期:2020.2.21
utilizing selectively deuterated dihydroaromatic compounds, which were generated by cobalt catalysis. The reaction was initiated by catalytic amounts of BF3·Et2O by abstracting hydride or deuteride ions from the respective dihydroaromatic reducing agents and led to a highly regioselective incorporation of deuterium and hydrogen at the desired positions of the starting material.
The first example of the thiyl radical promoted ligand-free iron-catalyzed oxidative cleavage of alkenes using molecular oxygen (1 atm) has been developed. The reaction proceeds under mild reaction conditions with high efficiency and high chemo- and regioselectivity. It features a broad substrate scope and excellent functional group compatibility, enabling facile access to valuable molecules for application
Reactions catalyzed by a binuclear copper complex: selective oxidation of alkenes to carbonyls with O<sub>2</sub>
作者:Yuxia Liu、Dong Xue、Chaoqun Li、Jianliang Xiao、Chao Wang
DOI:10.1039/c7cy01757j
日期:——
Terminal alkenes were selectivitely cleavaged into ketones and aldehydes catalysed by a binuclear copper catalyst bearing simple salicylate ligand with O2 as oxidant. The reaction was carried out under an atmosphere of O2 balloon with 0.5 mol% of catalyst and could be performed at a gram scale, providing a convenient and practical method for the cleavage of terminal alkenes into carbonyl compounds
Iodobenzene-catalyzed oxidative cleavage of olefins to carbonyl compounds
作者:Lele Du、Zechao Wang、Junliang Wu
DOI:10.1016/j.tetlet.2020.152204
日期:2020.8
A metal-free approach for the oxidativecleavage of carbon–carbon double bonds of olefins to carbonyl compounds was established by using oxidant m-CPBA and non-metallic organocatalyst PhI in toluene/H2O. A broad scope of aromatic olefins was used. All the reactions proceeded smoothly at 35 °C in short reaction time to furnish the respective mono- and double carbonyl compounds selectively in moderate
通过使用氧化剂m -CPBA和甲苯/ H 2 O中的非金属有机催化剂PhI,建立了一种无金属的方法将烯烃的碳-碳双键氧化裂解为羰基化合物。使用了广泛的芳族烯烃。所有反应均在35°C的短时间内顺利进行,以中等至良好的收率选择性提供各自的单羰基化合物和双羰基化合物。