The 1,4‐palladium shift strategy allows the functionalization of remote C−H bonds that are difficult to reach directly. Reported here is a domino reaction proceeding by C(sp3)−H activation, 1,4‐palladium shift, and amino‐ or alkoxycarbonylation, which generates a variety of amides and esters bearing a quaternary β‐carbon atom. Mechanistic studies showed that the aminocarbonylation of the σ‐alkylpalladium
In this work, the synthesis and reactivity of seven-membered palladacycles are described, and a novel bi-pyridines synthesis in a catalytic pathway is reported. Neophylpalladacycle (I) reacts with an excess of 2-Br-pyridine, giving the desired new binuclear seven-membered palladacycle (1) and unexpectedly, a bipyridine complex [Pd(BiPy)Br2]. ESI-HRMS experiments show that fragmentation into the Pd-Br
Direct Synthesis of Cyclopropanes from <i>gem</i>-Dialkyl Groups through Double C–H Activation
作者:Antonin Clemenceau、Pierre Thesmar、Maxime Gicquel、Alexandre Le Flohic、Olivier Baudoin
DOI:10.1021/jacs.0c05887
日期:2020.9.9
numerous bioactive molecules, and a number of methods are available for their synthesis. However, one of the simplest cyclopropanation reactions involving the intramolecular coupling of two C-H bonds in a single step has remained an elusive transformation. We demonstrate herein that this reaction is accessible using aryl bromide or triflate precursors and the 1,4-Pd shift mechanism. The use of pivalate
Experimental and Computational Studies of High-Valent Nickel and Palladium Complexes
作者:Nicole M. Camasso、Allan J. Canty、Alireza Ariafard、Melanie S. Sanford
DOI:10.1021/acs.organomet.7b00613
日期:2017.11.27
The accessibility of the MIII and MIV oxidation states with each metal is investigated through electrochemical and chemical oxidation of the MII precursors. These studies show that the NiII precursor readily undergoes both one- and two-electronoxidations to generate stable NiIII and NiIV products. In contrast, under the conditions examined, the PdII analogue undergoes exclusively two-electron-oxidation
was developed by using a C(sp3)−H activation/naphthol dearomatization approach. This bimolecular domino reaction of two aryl halides was realized through a sequence of cyclometallation‐facilitated C(sp3)−H activation, biaryl cross‐coupling, and naphthol dearomatization, thus rendering the rapidassembly of a new class of spirocyclic molecules in good yields with broad functional‐group tolerance. Preliminary