β-Amino alcohols from anilines and ethylene glycol through heterogeneous Borrowing Hydrogen reaction
作者:Pedro J. Llabres-Campaner、Rafael Ballesteros-Garrido、Rafael Ballesteros、Belén Abarca
DOI:10.1016/j.tet.2017.08.006
日期:2017.9
Borrowing Hydrogen (BH), also called Hydrogen Autotransfer (HA), reaction with neat ethylene glycol represents a key step in the preparation of β-amino alcohols. However, due to the stability of ethylene glycol, mono-activation has rarely been achieved. Herein, a combination of Pd/C and ZnO is reported as heterogeneous catalyst for this BH/HA reaction. This system results in an extremely air and moisture
Nickel-catalysed selective N-arylation or N,N′-diarylation of secondary diamines
作者:Eric Brenner、Raphaël Schneider、Yves Fort
DOI:10.1016/s0040-4020(02)00750-0
日期:2002.8
synthesis of N-aryl or N,N′-diaryl piperazines and trimethylene(bis)piperidines from the corresponding diamines and aryl chlorides using a catalyst combination of Ni(0) associated to 2,2′-bipyridine is described. The Ni/2,2′-bipyridine catalyst is also effective for the sequential arylation of piperazine. The preparation of novel and unsymmetrical 1,4-diaryl piperazines is reported.
Bischoff; Nastvogel, Chemische Berichte, 1890, vol. 23, p. 2026
作者:Bischoff、Nastvogel
DOI:——
日期:——
Nickel-mediated amination chemistry. Part 2: Selective N-arylation or N,N′-diarylation of piperazine
作者:Eric Brenner、Raphaël Schneider、Yves Fort
DOI:10.1016/s0040-4039(00)00277-x
日期:2000.4
The 2,2'-bipyridine liganded Ni catalyst has revealed a good selectivity in the mono arylation of piperazine starting from aryl chlorides allowing a selective and efficient synthesis of N-arylpiperazines using stoichiometric amounts of reagents. The preparation of N,N'-diaryl substituted piperazines is also described. (C) 2000 Elsevier Science Ltd. All rights reserved.
Synthesis of N-arylpiperazines from aryl halides and piperazine under a palladium tri-tert-butylphosphine catalyst
A Pd/P(t-Bu)(3) catalyst system has revealed very high activity and selectivity for the amination of N-(hetero)aryl halides with unprotected piperazine. A wide variety of N-(hetero)arylpiperazines could be prepared using this catalyst. Turnover numbers up to 6400mol/mol have been obtained. (C) 1998 Elsevier Science Ltd. All rights reserved.