Scope and Limitations of Pd2(dba)3/P(i-BuNCH2CH2)3N-Catalyzed Buchwald−Hartwig Amination Reactions of Aryl Chlorides
摘要:
Proazaphosphatrane ligands in combination with Pd-2(dba)(3) generate highly active catalysts for Buchwald-Hartwig amination of aryl chlorides. In particular, commercially available P(i-BuNCH2-CH2)(3)N is a highly general and efficient ligand, allowing the coupling of an electronically diverse set of aryl chlorides, including chloropyridines, with a wide variety of amines using 1 mol % of Pd at 100 degreesC. Either a 1:1 or 2:1 ratio of ligand to Pd was found to be effective. This catalyst system performs exceptionally well for sterically hindered substrates, even with only 0.25 mol % of Pd. It is shown that NaOH can also be used as the base (instead of NaO-t-Bu) allowing functionalized substrates to participate in these reactions.
Efficient C–N and C–Ocouplingreactions of aryl halides with amines and alcohols have been developed by using the strategy of heterogeneous visible light photoredox and nickel dual catalysis. Obviously, the joint use of inexpensive and bench-stable CdS and nickel salts, together with mild reaction conditions, makes these two transformations attractive for the synthetic community. This heterogeneous
Highly Reactive, General and Long-Lived Catalysts for Palladium-Catalyzed Amination of Heteroaryl and Aryl Chlorides, Bromides, and Iodides: Scope and Structure–Activity Relationships
作者:Qilong Shen、Tokutaro Ogata、John F. Hartwig
DOI:10.1021/ja077074w
日期:2008.5.1
chelating alkylphosphines for the amination of heteroaryl and aryl chlorides, bromides, and iodides. In the presence of this catalyst, aryl and heteroarylchlorides, bromides, and iodides react with many primary amines in high yields with part-per-million quantities of palladium precursor and ligand. Many reactions of primary amines with both heteroaryl and aryl chlorides, bromides, and iodides occur to
[EN] OXIDATIVE HOMO-COUPLING REACTIONS OF ARYL BORONIC ACIDS USING A POROUS COPPER METAL-ORGANIC FRAMEWORK AS A HIGHLY EFFICIENT HETEROGENEOUS CATALYST<br/>[FR] RÉACTIONS D’HOMOCOUPLAGE D’OXYDATION D’ACIDES BORONIQUES D’ARYLE UTILISANT UNE STRUCTURE POREUSE ORGANIQUE À BASE DE CUIVRE COMME CATALYSEUR HÉTÉROGÈNE EXTRÊMEMENT EFFICACE
申请人:UNIV CALIFORNIA
公开号:WO2011014503A1
公开(公告)日:2011-02-03
The disclosure provides methods for the use of open metal frameworks to synthesize biaryls comprising contacting a metal organic framework (MOF) or metal organic polyhedral (MOP) with an aryl boronic acid compound under conditions wherein the MOF or MOP catalyze the synthesis of the biaryl through a homo-coupling reaction.
Two Component Recyclable Heterogeneous Catalyst, Process for Preparation Thereof and its Use for Preparation of Amines
申请人:Likhar Pravin R.
公开号:US20110313158A1
公开(公告)日:2011-12-22
The invention describes the development of highly efficient, recyclable two component system, CuAl-hydrotalcite/rac 1,1′-Binaphthalene-2,2′-diol catalytic system for the N-alkylation of electron deficient aryl chlorides in presence of potassium carbonate as a base at room temperature in 3-6 h, wherein the process is provided for the preparation of various secondary amines via C—N coupling reaction of aliphatic amines(aliphatic open chain, acyclic, benzyl amines and heterocyclic amines) with various aryl chlorides.
Borane-amines undergo exclusive monoacetoxylation to trifluoroacetoxyborane-amines (TFAB-amines), which serve as chemoselective reagents for direct reductiveamination of aldehydes and ketones. TFAB-NEt3 has been established as mild and highly selective compared to widely-used NaBH3CN and Na(AcO)3BH, even at higher temperatures with challenging substrates. A mechanism involving polyaminoborane formed