Phenanthroline and tert-butoxide have been established as powerful radical initiators in reactions such as the S(RN)1-type coupling reactions due to the cooperation of large heteroarenes and a special feature of tert-butoxide. The first phenanthroline-tert-butoxide-catalyzed transition-metal-free allylic isomerization is described. The resulting ketones are key intermediates for indenes. The control experiments rule out the base-promoted allylic anion pathway. The radical pathway is supported by experimental evidence that includes kinetic study, kinetic isotope effect, isotope-labeling experiments, trapping experiments, and EPR experiments.
作者:Jason A. Marko、Anthony Durgham、Stacey Lowery Bretz、Wei Liu
DOI:10.1039/c8cc08768g
日期:——
An electrochemical benzylic C–H oxidation reaction that is mediated by tert-butyl peroxyl radical is reported.
一种由叔丁基过氧自由基介导的芳基C-H氧化反应被报道。
Organic Ligand-Free Alkylation of Amines, Carboxamides, Sulfonamides, and Ketones by Using Alcohols Catalyzed by Heterogeneous Ag/Mo Oxides
作者:Xinjiang Cui、Yan Zhang、Feng Shi、Youquan Deng
DOI:10.1002/chem.201001915
日期:2011.1.17
that is, amines, carboxamides, sulfonamides, and ketones, were successfully synthesized through a borrowing‐hydrogen mechanism. Up to 99 % isolated yields were obtained under relatively mild conditions without additive organic ligand. The catalytic process shows promise for the efficient and economic synthesis of amine, carboxamide, sulfonamide, and ketone derivatives because of the simplicity of the
复杂且昂贵的有机配体通常在制备或工业水平的精细化学合成中必不可少。通过使用不具有添加剂有机配体的非均相催化剂体系来合成精细化学品是非常合乎需要的,但由于它们的通用性差和严格的反应条件而受到严格限制。在这里,我们显示了具有特定Ag 6 Mo 10 O 33的Ag / Mo杂化材料催化形成碳-氮或碳-碳键的结果晶体结构。通过借氢机制成功合成了48种含氮或氧的化合物,即胺,羧酰胺,磺酰胺和酮。在没有添加剂有机配体的条件下,在相对温和的条件下可获得高达99%的分离产率。催化过程显示出胺,羧酰胺,磺酰胺和酮衍生物的高效经济合成的希望,因为该系统简单且易于操作。
Visible-Light-Promoted Photocatalyst-Free Hydroacylation and Diacylation of Alkenes Tuned by NiCl<sub>2</sub>·DME
作者:Xinxin Zhao、Bing Li、Wujiong Xia
DOI:10.1021/acs.orglett.9b04595
日期:2020.2.7
4-dihydropyridines via an acyl radical addition and hydrogen atom transfer pathway under photocatalyst-free conditions. The efficiency was highlighted by wide substrate scope, good to high yields, successful scale-up experiments, and expedient preparation of highly functionalized ketone derivatives. In addition, this protocol allows for the synthesis of 1,4-dicarbonyl compounds through alkene diacylation in the presence
Nickel-Catalyzed Alkylation of Ketone Enolates: Synthesis of Monoselective Linear Ketones
作者:Jagadish Das、Mari Vellakkaran、Debasis Banerjee
DOI:10.1021/acs.joc.8b02609
日期:2019.1.18
Herein we have developed a Ni-catalyzed protocol for the synthesis of linear ketones. Aryl, alkyl, and heteroaryl ketones as well as alcohols yielded the monoselective ketones in up to 90% yield. The catalytic protocol was successfully applied in to a gram-scale synthesis. For a practical utility, applications of a steroid derivative, oleyl alcohol, and naproxen alcohol were employed. Preliminary catalytic
The α-alkylation of ketones with alcohols in pure water catalyzed by a water-soluble Cp*Ir complex bearing a functional ligand
作者:Chong Meng、Jing Xu、Yawen Tang、Yao Ai、Feng Li
DOI:10.1039/c9nj03345a
日期:——
A water-soluble dinuclear Cp*Ir complex bearing 4,4′,6,6′-tetrahydroxy-2,2′-bipyrimidine as a bridging ligand was found to be a highly effective catalyst for the α-alkylation of ketones with alcohols in pure water. In the presence of catalyst (0.5 mol%), a series of desirable products were obtained with high reaction economy under environmentally benign conditions. The importance of the hydroxy group