三(吡唑基)硼酸钴配合物和路易斯碱的组合被开发为均相氢化中的有效催化剂前体。在60°C下用60 atm H 2还原包括羰基,烯烃,烯胺和亚胺在内的广泛底物范围。机理研究支持加氢过程通过沮丧的路易斯对(FLP)样还原过程进行。这些结果突出了新型非贵金属催化工艺的发展,并与FLP相关的各种小分子活化化学结合在一起。
Mild and Efficient Nickel-Catalyzed Heck Reactions with Electron-Rich Olefins
作者:Thomas M. Gøgsig、Jonatan Kleimark、Sten O. Nilsson Lill、Signe Korsager、Anders T. Lindhardt、Per-Ola Norrby、Troels Skrydstrup
DOI:10.1021/ja2084509
日期:2012.1.11
A new efficient protocol for the nickel-catalyzed Heckreaction of aryl triflates with vinyl ethers is presented. Mild reaction conditions that equal those of the corresponding palladium-catalyzed Heckreaction are applied, representing a practical and more sustainable alternative to the conventional regioselective arylation of vinyl ethers. A catalytic system comprised of Ni(COD)(2) and 1,1'-bis(
Direct Enamido C(sp<sup>2</sup>)−H Diphosphorylation Enabled by a PCET‐Triggered Double Radical Relay: Access to<i>gem</i>‐Bisphosphonates
作者:Hao‐Qiang Cao、Hao‐Nan Liu、Zhe‐Yuan Liu、Bao‐Kun Qiao、Fa‐Guang Zhang、Jun‐An Ma
DOI:10.1002/chem.202000517
日期:2020.4.24
electron-transfer (PCET)-triggered enamidoC(sp2 )-Hdiphosphorylation. This reaction represents a rare example of realizing the challenging double C-P bond formation at a single carbon atom, thus providing facile access to a broad variety of structurally diverse bisphosphonates from simple enamides under silver-mediated conditions. Initial mechanistic studies demonstrated that the diphosphorylation involves
Thiyl‐radical‐catalyzed cyclization reactions of N‐tosyl vinylaziridines and alkenes were developed as a new synthetic method for the generation of substituted pyrrolidines. The key to making this process accessible to a broad range of substrates is the use of a sterically demanding thiyl radical, which prevents the undesired degradation of the catalyst.
Aqueous SDS micelle-promoted acid-catalyzed domino ABB′ imino Diels–Alder reaction: a mild and efficient synthesis of privileged 2-methyl-tetrahydroquinoline scaffolds
作者:Diego R. Merchán Arenas、Carlos A. Martínez Bonilla、Vladimir V. Kouznetsov
DOI:10.1039/c3ob40171e
日期:——
A new green protocol for the efficientsynthesis of pharmacologically relevant 4-amidyl-2-methyl-1,2,3,4-tetrahydroquinolines (THQs) through the domino type ABB′ imino Diels–Alder reaction in acidified water in the presence of sodiumdodecyl sulphate (SDS) surfactant was developed for the first time. The influence of the SDS micelles and their different concentrations (5.0, 8.2 and 12.0 mM) on reactivity
Further Studies on the Direct Synthesis of<i>α</i>,<i>β</i>-Unsaturated Ketimines and<i>α</i>,<i>β</i>-Enones by Chemoselective Dehydrative Addition of Functionalized Alkenes to Secondary Amides
作者:Pei-Qiang Huang、Ying-Hong Huang
DOI:10.1002/cjoc.201600700
日期:2017.5
including ester, α,β‐unsaturatedester, uncongested ketone groups, as well as enol derivatives of acetaldehyde such as enol ether and enamides. The electrophilic partner has been extended from N‐(2,6‐dimethylphenyl) and N‐methyl amides to N‐n‐butyl, and N‐cyclohexyl amides. The results demonstrated that the method can be used to synthesize a number of functionalized α,β‐unsaturated ketimines and α,β‐enones