Preparation of <i>N</i>-Alkyl 2-Pyridones via a Lithium Iodide Promoted <i>O</i>- to <i>N</i>-Alkyl Migration: Scope and Mechanism
作者:Sarah Z. Tasker、Michael A. Bosscher、Christina A. Shandro、Erica L. Lanni、Keun Ah Ryu、Gregory S. Snapper、Jarrad M. Utter、Bruce A. Ellsworth、Carolyn E. Anderson
DOI:10.1021/jo3015424
日期:2012.9.21
An efficient and inexpensive LiI-promoted O- to N-alkyl migration of 2-benzyloxy-, 2-allyloxy-, and 2-propargyloxypyridines and heterocycles is reported. The reaction produces the corresponding N-alkyl 2-pyridones and analogues under green, solvent-free conditions in good to excellent yields (30 examples, 20–97% yield). This method has been shown to be intermolecular and requires heat and lithium cation
Visible Light-Induced Deoxygenation and Allylation/Vinylation of Pyridyl Ethers
作者:Fan Wang、Yuwen Tang、Xiang Li、Jingtian Chen、Jingyue Yang
DOI:10.1021/acs.orglett.2c02756
日期:2022.10.14
The generation of alkyl radicals by deoxygenation of unactivated ethers under visible light catalysis is a hitherto unmet challenge. Herein, we report a visible light-induced deoxygenation of pyridyl ethers via formation of their pyridinium salts. The generated benzylic radicals further react with allyl/alkenyl sulfones to provide a series of coupling products in good to moderate yields. This process
Homocoupling of benzyl pyridyl ethers <i>via</i> visible light-mediated deoxygenation
作者:Jingtian Chen、Fan Wang、Xiang Li、Lei Wang、Wei Yu、Keju Sun、Jingyue Yang
DOI:10.1039/d3cc03002d
日期:——
The photocatalytic coupling of ethers is uncommon because of the challenges in breaking C–O bonds and low selectivity. Herein, we report a visible light-mediated deoxygenation homocoupling of benzyl pyridyl ethers via their pyridium salts. This approach enables C(sp3)–O bondhomolysis under mild conditions. Mechanistic experiments support the radical nature of the reaction. This method is highly compatible