Polymer-Supported Copper Complex for C−N and C−O Cross-Coupling Reactions with Aryl Boronic Acids
作者:Gary C. H. Chiang、Thomas Olsson
DOI:10.1021/ol048943e
日期:2004.9.1
[reaction: see text] Immobilization of copper onto modified Wang resin provided a polymer-supported copper catalyst, which is effective in cross-coupling reactions between N- or O-containing substrates and arylboronic acids. The copper catalyst is air stable and can be recycled with minimal loss of activity.
Copper-Catalyzed Coupling of Arylboronic Acids and Amines
作者:Jon C. Antilla、Stephen L. Buchwald
DOI:10.1021/ol0160396
日期:2001.6.1
[GRAPHICS]A general catalytic coupling of arylboronic acids and amines is reported. This room-temperature coupling was realized through the use of catalytic copper(II) acetate, 2,6-lutidine as base, and myristic acid as an additive. Functionalized aniline substrates provided the diarylamine coupling products in good yield (58-91%), A variety of alkylamines were also successfully coupled to give N-alkyl anilines in moderate yield (50-64%).
N- versus O-Arylation of Aminoalcohols: Orthogonal Selectivity in Copper-Based Catalysts
作者:Alexandr Shafir、Phillip A. Lichtor、Stephen L. Buchwald
DOI:10.1021/ja068926f
日期:2007.3.1
Two complementary protocols for copper-catalyzed arylation of aminoalcohols were developed. Selective N-arylation was accomplished at room temperature using 2-isobutyrylcyclohexanone (a beta-diketone) as supporting ligand, while selective O-arylation required the use of 3,4,7,8-tetramethylphenanthroline at 80-110 degrees C. Systematic examination of the reaction scope revealed that high levels of selectivity are achieved for a variety of substrates, provided that nonchelating (or weakly chelating) aminoalcohols are used. The generality of the method was highlighted by the synthesis, in a pairwise fashion, of a number of functionalized N- and O-arylated aminoalcohols.