Synthesis of carbonylated heteroaromatic compounds via visible-light-driven intramolecular decarboxylative cyclization of o-alkynylated carboxylic acids
An efficient strategy for the easy access to carbonylated heteroaromatic compounds has been developed via a visible-light-promoted intramolecular decarboxylative cyclization reaction of o-alkynylated carboxylic acids. This method is characterized by its benign conditions and the tolerance to a wide range of functionalities.
The intermolecular Friedel–Crafts acylation was carried out in hexafluoro-2-propanol to yield aryl and heteroaryl ketones at room temperature without any additional reagents.
benzophenanthrothiophenes 14–17 through Elbs cyclodehydration of ortho-methylated aroylbenzo[b]thiophenes is described. The occurrence of a rearrangement of the thiophene ring in the course of the cyclization is discussed as well as the influence of the temperature on a concurrent cyclodehydration process. Several of these poly-condensed thiophenes were found carcinogenic in mice.
描述了通过邻甲基化的芳酰基苯并[ b ]噻吩的Elbs环脱水反应合成苯并萘噻吩9和10以及苯并噻吩噻吩14-17。讨论了环化过程中噻吩环重排的发生以及温度对同时进行的环脱水过程的影响。发现这些缩聚噻吩中的几种在小鼠中具有致癌性。
The first vinylogous dearomatization is reported. Under a photoinduced platform, various benzothiophenes functionalized by ketones at the 3-position could react with 3-methylenechroman-4-ones efficiently, leading to a variety of valuable products that contain the pharmaceutically significant chromones and 2,3-dihydrobenzo[b]thiophenes concurrently. The transformations were revealed to experience hydrogen-atom
Metal‐Free Arylation of Benzothiophenes at C4 by Activation as their Benzothiophene S‐Oxides
作者:Ranjana Bisht、Mihai V Popescu、Zhen He、Ameer M Ibrahim、Giacomo E M Crisenza、Robert S Paton、David John Procter
DOI:10.1002/anie.202302418
日期:——
key structures in materials and medicines and methods for their selective C−H functionalization are highly prized. Activation of benzothiophenes bearing electron-withdrawing groups at C3 as their S-oxides enables formal C−H/C−H coupling with phenols to access C4 arylated benzothiophenes. Computational studies suggest the intermediacy of a π-complex between the benzothiophene and a phenoxonium cation