Catalytic Allylic Oxidation to Generate Vinylogous Acyl Sulfonates from Vinyl Sulfonates
作者:James K. Tucker、Matthew D. Shair
DOI:10.1021/acs.orglett.9b00845
日期:2019.4.5
formation of vinylogous acyl sulfonates was accomplished via the allylic oxidation of the corresponding vinyl sulfonates. The reaction progressed through the agency of catalytic iron(III) chloride catalysis with tert-Butyl hydroperoxide (TBHP) as the stoichiometric oxidant. Tolerance of other functional groups, including some other allylic and benzylic sites, was observed.
Multimetallic Ni- and Pd-Catalyzed Cross-Electrophile Coupling To Form Highly Substituted 1,3-Dienes
作者:Astrid M. Olivares、Daniel J. Weix
DOI:10.1021/jacs.7b13601
日期:2018.2.21
synthesis of highly substituted 1,3-dienes from the coupling of vinyl bromides with vinyl triflates is reported for the first time. The coupling is catalyzed by a combination of (5,5'-bis(trifluoromethyl)-2,2'-bipyridine)NiBr2 and (1,3-bis(diphenylphosphino)propane)PdCl2 in the presence of a zinc reductant. This method affords tetra- and penta-substituted 1,3-dienes that would otherwise be difficult
Pd-Catalyzed Carbonylation of Vinyl Triflates To Afford α,β-Unsaturated Aldehydes, Esters, and Amides under Mild Conditions
作者:Shaoke Zhang、Helfried Neumann、Matthias Beller
DOI:10.1021/acs.orglett.9b00765
日期:2019.5.17
An efficient and general protocol for the synthesis of α,β-unsaturated aldehydes, esters, and amides via carbonylation of vinyl triflates including derivatives of camphor, ketoisophorone, verbenone, and pulegone was developed. Crucial for these transformations is the use of a specific palladium catalyst containing a pyridyl-substituted dtbpx-type ligand. This procedure also allows for an easy access
开发了一种有效的通用方案,可通过乙烯基三氟甲磺酸酯的羰基化反应合成α,β-不饱和醛,酯和酰胺,包括樟脑,酮异佛尔酮,马鞭草酮和普乐酮。这些转化的关键是使用含有吡啶基取代的d t bpx型配体的特定钯催化剂。该方法还使得容易从相应的酮获得二羰基化产物。
Rh<sub>2</sub>(II)-Catalyzed Intramolecular Aliphatic C–H Bond Amination Reactions Using Aryl Azides as the N-Atom Source
作者:Quyen Nguyen、Ke Sun、Tom G. Driver
DOI:10.1021/ja301519q
日期:2012.5.2
Rhodium(II) dicarboxylate complexes were discovered to catalyze the intramolecularamination of unactivated primary, secondary, or tertiary aliphatic C-H bonds using arylazides as the N-atom precursor. While a strong electron-withdrawing group on the nitrogen atom is typically required to achieve this reaction, we found that both electron-rich and electron-poor arylazides are efficient sources for
发现二羧酸铑 (II) 配合物使用芳基叠氮化物作为 N 原子前体催化未活化的伯、仲或叔脂肪族 CH 键的分子内胺化。虽然通常需要氮原子上的强吸电子基团来实现该反应,但我们发现富电子和缺电子芳基叠氮化物都是金属氮烯反应中间体的有效来源。
Electrochemical Deoxygenative Thiolation of Preactivated Alcohols and Ketones
作者:Feng Zhang、Yang Wang、Yi Wang、Yi Pan
DOI:10.1021/acs.orglett.1c02738
日期:2021.10.1
This work describes an electrochemically promoted nickel-catalyzed deoxygenative thiolation of alcohols and ketones under mild conditions. Excellent substrate tolerance and good chemical yields can be achieved by graphene/nickel foam electrodes in an undivided cell. Further study to gain mechanistic insight into this electrochemical cross-coupling has been carried out.