Streamlined Synthesis of the Bippyphos Family of Ligands and Cross-Coupling Applications
作者:Gregory J. Withbroe、Robert A. Singer、Janice E. Sieser
DOI:10.1021/op7002858
日期:2008.5.1
the efficient preparation of Bippyphos, 1. The key precursor to Bippyphos, 5, was prepared via a one-pot bromination of diketone 2 followed by alkylation with pyrazole and condensation with phenylhydrazine. Lithiation of 5 and trapping with di-tert-butylchlorophosphine afforded Bippyphos, 1. Using this approach we have prepared several derivatives of Bippyphos to probe the structure and activity relationships
Robust Acenaphthoimidazolylidene Palladacycles: Highly Efficient Catalysts for the Amination of N-Heteroaryl Chlorides
作者:Qinyue Deng、Yang Zhang、Haibo Zhu、Tao Tu
DOI:10.1002/asia.201700877
日期:2017.9.19
A series of robust N‐heterocyclic carbene palladacycles have been successfully developed. These showed high catalytic activity and selectivity toward the challenging amination of N‐heteroaryl chlorides. Different primary and secondary amines were fully compatible with this catalytic system. Remarkably, no double amination products could be detected when primary amines were utilized in our catalytic
Ligand-Free Copper-Catalyzed Amination of Heteroaryl Halides with Alkyl- and Arylamines
作者:Zhen-Jiang Liu、Jean-Pierre Vors、Ernst R. F. Gesing、Carsten Bolm
DOI:10.1002/adsc.201000708
日期:2010.12.17
N-Heteroarylations of alkyl- and arylamines with various heteroarylhalides have been achieved by ligand-freecopper-catalyzed cross-couplings affording aminopyridines and aminopyrimidines in moderate to high yields (up to 99% yield).
Pd-Catalyzed Aryl Amination Mediated by Well Defined, N-Heterocyclic Carbene (NHC)–Pd Precatalysts, PEPPSI
作者:Michael G. Organ、Mirvat Abdel-Hadi、Stephanie Avola、Igor Dubovyk、Niloufar Hadei、Eric Assen B. Kantchev、Christopher J. O'Brien、Mahmoud Sayah、Cory Valente
DOI:10.1002/chem.200701621
日期:2008.3.7
Pd-N-heterocyclic carbene (NHC)-catalyzed Buchwald-Hartwig amination protocols mediated by Pd-PEPPSI precatalysts is described. These protocols provide access to a range of hindered and functionalized drug-like aryl amines in high yield with both electron-deficient and electron-rich aryl- and heteroaryl chlorides and bromides. Variations in solvent polarity, base and temperature are tolerated, enhancing
Palladium-Catalysed Amination of Aryl- and Heteroaryl Halides Using<i>tert</i>-Butyl Tetraisopropylphosphorodiamidite as an Easily Accessible and Air-Stable Ligand
作者:Gheorghe-Doru Roiban、Gerlinde Mehler、Manfred T. Reetz
DOI:10.1002/ejoc.201301789
日期:2014.4
phosphorus compound tert-butyl tetraisopropylphosphorodiamidite, prepared from bis(diisopropylamino)chlorophosphine, is an excellent ligand for palladium-catalysed Buchwald–Hartwig amination of aryl- and heteroaryl chlorides and bromides. Based on its ready accessibility and air-stability, this amination protocol is a practical approach to the synthesis of industrially important aryl- and heteroarylamines.