[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
Steric and Electronic Parameters of a Bulky yet Flexible N-Heterocyclic Carbene: 1,3-Bis(2,6-bis(1-ethylpropyl)phenyl)imidazol-2-ylidene (IPent)
作者:Alba Collado、János Balogh、Sebastien Meiries、Alexandra M. Z. Slawin、Laura Falivene、Luigi Cavallo、Steven P. Nolan
DOI:10.1021/om400168b
日期:2013.6.10
The free N-heterocyclic carbene IPent (1; IPent = 1,3-bis(2,6-bis(1-ethylpropyl)phenyl)imidazol-2-ylidene) was prepared from the corresponding imidazolium chloride salt (2). The steric and electronic parameters of 1 were determined by synthesis of the gold(I) chloride complex [Au(IPent)Cl] (3) and the nickel-carbonyl complex [Ni(IPent)(CO)(3)] (4), respectively. 3 and 4 were fully characterized by NMR spectroscopy, elemental analysis, and X-ray diffraction studies on single crystals.