modified Ullmann couplingreactions creating C–O bonds, including diaryl ethers or phenols, are vital to organic synthesis. Synthesized N-phenyl-2-pyridinecarboxamide and its derivatives were used as ligands in conjunction with catalytic copper sources in the formation of various diaryl ethers and phenols. Various aryl and heteroaryl halides with electron donating and withdrawinggroups were reacted with
Method of forming a carbon-carbon or carbon-heteroatom linkage
申请人:Taillefer Marc
公开号:US20050234239A1
公开(公告)日:2005-10-20
The invention relates to a method of creating a carbon-carbon or carbon-heteroatom linkage by reacting an unsaturated compound bearing a leaving group and a nucleophilic compound. More specifically, the invention relates to the creation of a carbon-nitrogen linkage involving the arylation of nitrogenous organic derivatives. The inventive method consists in creating a carbon-carbon or carbon-heteroatom linkage by reacting an unsaturated compound bearing a leaving group and a nucleophilic compound providing a carbon atom or a heteroatom (HE) capable of being substituted for the leaving group, thereby creating a C—C or C-HE linkage. The invention is characterised in that the reaction is carried out in the presence of an effective quantity of a catalyst based on copper and at least one ligand comprising at least one imine function and at least one additional nitrogen atom as chelating atoms
Copper(I)–USY as a Ligand-Free and Recyclable Catalyst for Ullmann-Type <i>O</i>-, <i>N</i>-, <i>S</i>-, and <i>C</i>-Arylation Reactions: Scope and Application to Total Synthesis
copper(I)-doped zeolite CuI–USY proved to be a versatile, efficient, and recyclable catalyst for various Ullmann-typecoupling reactions. Easy to prepare and cheap, this catalytic material enables the arylation and heteroarylation of diverse O-, N-, S-, and C-nucleophiles underligand-freeconditions while exhibiting large functional group compatibility. The facility of this catalyst to promote C–O bond