Selective Monoarylation of Primary Amines Using the Pd-PEPPSI-IPent<sup>Cl</sup>Precatalyst
作者:Sepideh Sharif、Richard P. Rucker、Nalin Chandrasoma、David Mitchell、Michael J. Rodriguez、Robert D. J. Froese、Michael G. Organ
DOI:10.1002/anie.201502822
日期:2015.8.10
A single set of reaction conditions for the palladium‐catalyzed amination of a wide variety of (hetero)aryl halides using primaryalkyl amines has been developed. By combining the exceptionally high reactivity of the Pd‐PEPPSI‐IPentCl catalyst (PEPPSI=pyridine enhanced precatalyst preparation, stabilization, and initiation) with the soluble and nonaggressive sodium salt of BHT (BHT=2,6‐di‐tert‐butyl‐hydroxytoluene)
Efficient and Versatile Buchwald-Hartwig Amination of (Hetero)aryl Chlorides Using the Pd-PEPPSI-IPr<sup>(NMe2)2</sup>Precatalyst in the Presence of Carbonate Base
作者:Yin Zhang、Vincent César、Guy Lavigne
DOI:10.1002/ejoc.201500030
日期:2015.3
precatalyst Pd-PEPPSI-IPr(NMe2)2, in which the IPr ligand was modified by attachment of two dimethylamino groups on to the 4- and 5-positions of the imidazolyl heterocycle, was found to show high catalytic efficiency in the Buchwald-Hartwigamination under mild conditions using Cs2CO3 as a weak base, using a low catalyst loading of 1 mol-%. The protocol is applicable to arylchlorides bearing base-sensitive
Well-defined NHC–Pd(II)–Im (NHC=N-heterocyclic carbene; Im=1-methylimidazole) complex catalyzed C–N coupling of primary amines with aryl chlorides
作者:Lei Zhu、Yue-Mei Ye、Li-Xiong Shao
DOI:10.1016/j.tet.2012.01.008
日期:2012.3
We report herein a well-defined NHC-Pd(II)-Im(NHC=N-heterocyclic carbene; Im=1-methylimidazole) complex catalyzed C-N coupling of primary amines with aryl chlorides. Under the optimal reaction conditions, a variety of primary amines can be coupled with aryl chlorides to give the amination products in good to high yields within 4 h. It is worthy of noting here that the NHC-Pd(II)-Im complex showed especially high catalytic activity toward challenging sterically hindered substrates including both of aryl amines and aryl chlorides. In addition, alkyl amines were also proved to be suitable reaction partners to give the corresponding amination products in good to high yields. (C) 2012 Elsevier Ltd. All rights reserved.