An efficient protocol for the Cα-H heteroarylation of ethers, amides, and alcohols using air and light under mild conditions is described. The reaction is applicable to a wide spectrum of functional groups. The generation of C-radicals via photoinduced aerobic oxidation of ethers, amides, and alcohols is the key feature of the process. Control experiments suggest a radical pathway for the reaction
描述了在温和条件下使用空气和光对醚、酰胺和醇进行 Cα - H 杂芳基化的有效方案。该反应适用于广泛的官能团。通过醚、酰胺和醇的光诱导有氧氧化产生 C-自由基是该过程的关键特征。对照实验表明该反应的自由基途径。
Mn(II)-Catalyzed C–H Alkylation of Imidazopyridines and <i>N</i>-Heteroarenes via Decarbonylative and Cross-Dehydrogenative Coupling
作者:Sadhanendu Samanta、Alakananda Hajra
DOI:10.1021/acs.joc.9b00366
日期:2019.4.5
A Mn(II)-catalyzed efficient C–H alkylation of imidazoheterocycles and N-heteroarenes with aliphatic aldehydes has been developed via oxidative decarbonylation. Other alkylating agents such as cyclic alkanes, ethers, and alcohols also coupled with N-heteroarenes through cross-dehydrogenative coupling. Regioselectively C5-alkylated imidazoheterocycles were synthesized in good yields. Experimental results
Direct Cα-heteroarylation of structurally diverse ethers via a mild N-hydroxysuccinimide mediated cross-dehydrogenative coupling reaction
作者:Shihui Liu、Aoxia Liu、Yongqiang Zhang、Wei Wang
DOI:10.1039/c6sc05697k
日期:——
An important challenge in the Cα-heteroarylation of ethers is the requirement of a large excess amount of ethers (that are used as solvents in many cases) to achieve effective transformations. This drawback has significantly restricted the Cα-heteroarylation of ethers to the use of simple and easily accessible ether substrates. To overcome this limitation, a new, efficient, N-hydroxysuccinimide (NHS)
A novel PIFA‐mediated cross‐dehydrogenativecoupling (CDC) reaction of N‐heteroarenes with cyclic ethers has been reported. The reaction utilizes simple and cheap ethanol as the promoter in the presence of visible light, which is mild and efficient and allows the facile transformation of a variety of complex and highly functionalized cyclic ethers into medicinally valuable Cα‐heteroarylated cyclic