A Selective C−H Deprotonation Strategy to Access Functionalized Arynes by Using Hypervalent Iodine
作者:Sunil K. Sundalam、Aleksandra Nilova、Thomas L. Seidl、David R. Stuart
DOI:10.1002/anie.201603222
日期:2016.7.11
highly functionalized arynesfrom unsymmetrical aryl(mesityl)iodonium tosylate salts. The iodonium salts are prepared in a single pot from either commercially available aryl iodides or arylboronic acids. The aryne intermediates are generated by ortho‐C−H deprotonation of aryl(mesityl)iodonium salt with a commercially available amide base and trapped in a cycloaddition reaction with furan in moderate to good
A new generation method of benzyne has been developed. When 1,2-dihalogen substituted arenes were allowed to react with lanthanum metal in the presence of dienes, Diels–Alder products between benzyne and dienes were formed in moderate to good yields.
Synthesis of Alkyl Aryl Ethers by O-Arylation of Alcohols with Diaryliodonium Salts: Scope, Limitations, and Mechanism
作者:David R. Stuart、Rory T. Gallagher、Soocheta Jha、Bryan E. Metze
DOI:10.1055/a-2198-3637
日期:2024.5
6-trimethoxyphenyl)iodonium salts and aliphatic alcohols under weak base conditions. The scope of the reaction is presented, with 16 examples ranging in yield from moderate to high (54–96%). The limitations of the reaction are also presented. Mechanistic experiments reveal a complex network of reactions that include side reactions that generate arynes and oxidize the alcohol nucleophile.
It was found that lanthanum metal caused the dehalogenation of o-dihalogen substituted arenes and alpha,alpha'-dihalogen substituted o-xylenes to generate the corresponding benzynes and o-quinodimethanes. When o-dihalogen substituted arenes were allowed to react with lanthanum metal in the presence of dienes, the Diels-Alder products between benzyne and dienes were formed in moderate to good yields. Similarly, the Diels-Alder adducts of o-quinodimethane with dienophiles were obtained, in the reaction of alpha,alpha'-dibromo-o-xylenes with lanthanum metal in the presence of dienophiles. (C) 2003 Elsevier Ltd. All rights reserved.