Synthesis and characterisation of Au(I)-(ITent) complexes
摘要:
The synthesis of novel [AuCl(ITent)] and [Au(OH)(ITent)] complexes is reported. They have been fully characterised and their steric parameters were assessed by calculating percent buried volumes and producing steric maps from their crystal structures in the solid state. (C) 2014 Published by Elsevier B.V.
Towards environmentally friendlier Suzuki–Miyaura reactions with precursors of Pd-NHC (NHC = N-heterocyclic carbene) complexes
作者:Caroline M. Zinser、Katie G. Warren、Rebecca E. Meadows、Fady Nahra、Abdullah M. Al-Majid、Assem Barakat、Mohammad S. Islam、Steven P. Nolan、Catherine S. J. Cazin
DOI:10.1039/c8gc00860d
日期:——
preparation of [NHC·H][Pd(η3-R-allyl)Cl2] complexes is disclosed and represents a facile, atom-economical, environmentally friendly and rapid synthesis. These palladates are immediate synthetic precursors to the well-known [Pd(NHC)(η3-R-allyl)Cl] complexes. Their activation leading to catalytically relevant species has been studied in the Suzuki–Miyaura reaction. The need for an activation step prior
A simple synthetic entryway into palladium cross-coupling catalysis
作者:Caroline M. Zinser、Fady Nahra、Marcel Brill、Rebecca E. Meadows、David B. Cordes、Alexandra M. Z. Slawin、Steven P. Nolan、Catherine S. J. Cazin
DOI:10.1039/c7cc02487h
日期:——
The simple synthesis of a family of palladates containing an imidazolium counterion is presented. These “ate” complexes can be easily converted into well-defined palladium–N-heterocyclic carbene (NHC) complexes. The synthetic protocols leading to the “ate” and to the Pd–NHC neutral complexes have been exemplified with various NHC ligands. The palladates prove efficient pre-catalysts enabling Suzuki–Miyaura
Pd-PEPPSI-IPent<sup>Cl</sup>: A Highly Effective Catalyst for the Selective Cross-Coupling of Secondary Organozinc Reagents
作者:Matthew Pompeo、Robert D. J. Froese、Niloufar Hadei、Michael G. Organ
DOI:10.1002/anie.201205747
日期:2012.11.5
of new N‐heterocyclic carbene based Pd complexes has been created and evaluated in the Negishi cross‐coupling of aryl and heteroaryl chlorides, bromides, and triflates with a variety of secondary alkylzinc reagents (see scheme). The direct elimination product is nearly exclusively formed; in most examples there is no migratory insertion at all.
[EN] SYNTHESES OF N-HETEROCYCLIC CARBENES AND INTERMEDIATES THEREFOR<br/>[FR] SYNTHÈSES DE CARBÈNES N-HÉTÉROCYCLIQUES ET INTERMÉDIAIRES À CET EFFET
申请人:UNIV ST ANDREWS
公开号:WO2014108671A1
公开(公告)日:2014-07-17
A method of preparing a 2,6 disubstituted anilines includes, reacting a 2-amino isophtha!ic acid diester with sufficient Grignard reagent R2CH2MgX to form the corresponding diol product, dehydrating the diol product to the corresponding dialkene; and hydrogenating the diol product to form the corresponding aniline. The 2,6 disubstituted anilines can be used to produce N-Heterocyciic Carbenes (NHCs). The NHCs can find application in various fields such as organic synthesis, catalysis and macromolecular chemistry. Palladium catalysts containing the NHCs are also described.
The Selective Cross-Coupling of Secondary Alkyl Zinc Reagents to Five-Membered-Ring Heterocycles Using Pd-PEPPSI-IHept<sup>Cl</sup>
作者:Bruce Atwater、Nalin Chandrasoma、David Mitchell、Michael J. Rodriguez、Matthew Pompeo、Robert D. J. Froese、Michael G. Organ
DOI:10.1002/anie.201503941
日期:2015.8.10
leads to β‐hydride elimination. Whereas catalysts have been reported that provide decent selectivity for the expected (non‐rearranged) cross‐coupled product with aryl or heteroaryl oxidative‐addition partners, none have shown reliable selectivity with five‐membered‐ring heterocycles. In this report, a new, rationally designed catalyst, Pd‐PEPPSI‐IHeptCl, is demonstrated to be effective in selective