An efficient approach to 3-thioether-functionalized 2,3-dihydrobenzofurans via a metal-free intramolecular radical cyclization/thiolation cascade reaction
作者:Tingting Chen、Renhua Zheng、Jingmiao Yu
DOI:10.1080/00397911.2021.1927098
日期:2021.7.18
Abstract A diverse series of 3-thioether-functionalized 2,3-dihydrobenzofurans were prepared by an intramolecular radical cyclization/thiolation cascade reaction of alkenyl-tethered arenediazonium salts with thiophenols under transition-metal-free conditions. The mild and practical reaction conditions tolerated various functional groups and afforded the corresponding 2,3-dihydrobenzofurans in moderate
Photo-induced Carboiodination: A Simple Way to Synthesize Functionalized Dihydrobenzofurans and Indolines
作者:Xiaobo Yang、Wenbo Liu、Lu Li、Wei Wei、Chao-Jun Li
DOI:10.1002/chem.201603608
日期:2016.10.17
readily available and cheap aryl bromides and sodium iodide as the starting materials to synthesize valuable functionalized dihydrobenzofurans and indolines in good to excellent yields with broad functional‐group compatibility. As examples to demonstrate the utility of this protocol, gram‐scale reactions and further transformations of the products were accomplished towards the synthesis of bioactive
Practical Reagents and Methods for Nucleophilic and Electrophilic Phosphorothiolations
作者:Szabolcs Kovács、Bilguun Bayarmagnai、Alexandre Aillerie、Lukas J. Gooßen
DOI:10.1002/adsc.201701549
日期:2018.5.16
using nucleophilic and electrophilicreagents. The nucleophilic reagent, tetramethylammonium O,O‐dimethyl phosphorothioate, was synthesized in near‐quantitative yield from Me3SiP(O)(OMe)2, elemental sulfur and Me4NF. Its umpolung with N‐bromophthalimide provided the electrophilicreagent, O,O‐dimethyl‐S‐(N‐phthalimido)phosphorothioate. Complementary methods based on these reagents enable the phosphorothiolation
Presented in this paper is photoinduced hydroxylation of organic halides, providing a mild access to a range of functionalized phenols and aliphatic alcohols. These reactions generally proceed under mild reaction conditions with no need for a photocatalyst or a strong base and show a wide substrate scope as well as excellent functional group tolerance. This work highlights the unique role of NaI that
A novel method for selective generation of aryl radicals from diaryliodonium salts and iodanylidene malonates with sodium 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPONa) as a single‐electron transfer (SET) reducing reagent is described. In the presence of various alkenes, aryl radicals formed after SET‐reduction of hypervalent iodine compounds undergo alkene addition and the adduct radicals that are