Rhodium-catalyzed synthesis of unsymmetric di(heteroaryl) compounds via heteroaryl exchange reactions
作者:Mieko Arisawa
DOI:10.1080/10426507.2019.1602621
日期:2019.7.3
activities by interacting with proteins and nucleic acids. Then, synthesis of such compounds is critical for the development of drugs. Unsymmetric HetAr-X-HetAr′ compounds were efficiently synthesized by rhodium-catalyzed heteroaryl exchangereactions, which involved equilibrium control by judicious design of organic heteroaryl reagents. This method allows synthesis of unsymmetric HetAr–O–HetAr′, HetAr–S–HetAr′
The direct amination of benzoxazoles at C2 using N-heterocycles as nitrogen sources has been developed for the first time. Several kinds of inexpensive oxidants and also electricity were effective for this transformation in the presence of 2,2,6,6-tetramethylpiperidine-N-oxyl. This metal-free and operationally simple reaction can afford a variety of important C,N′-linked bis-heteocycles in moderate
ureas, and cyclic imides using heteroaryl aryl ethers. The reaction involves the covalent bond-exchange reaction of N–CO and HetAr–O bonds without using metal bases and exhibits a broad applicability, giving diverse C–N-linked bi(heteroaryl)s containingfive- and six-membered heteroarenes. The N-heteroarylation of N–H azoles/azolones and pyridone proceeds at higher reaction temperatures.
Electrochemical Desulfurizative Amination of Heteroaromatic Thiols by Iodine Catalysis
作者:Tingting Ran、Wei Jiang、Xin Fu、Jinguo Long、Jie Liu
DOI:10.1002/cctc.202301750
日期:——
We report that anodic oxidation of 2-iodobenzoic acid enables a hypervalent iodine (III) electrocatalysis of desulfurizative amination of heteroaromatic thiols. This protocol features broad substrate scope and wide functional group tolerance, delivering the target N-heterocyclic amines with good to excellent yields.