Synthesis of Substituted <i>N</i>-Benzyl Pyridones via an <i>O</i>- to <i>N</i>-Alkyl Migration
作者:Erica L. Lanni、Michael A. Bosscher、Bartel D. Ooms、Christina A. Shandro、Bruce A. Ellsworth、Carolyn E. Anderson
DOI:10.1021/jo800866w
日期:2008.8.1
A new LiI-promoted O- to N-alkyl migration has been developed for the conversion of O-alkylated 2-hydroxy pyridines, quinolines, and pyrimidines to the corresponding N-alkylated heterocycles in good to excellent yields (57−99%). This method serves as an efficient means for the preparation of N-benzyl pyridones, quinolones, and pyrimidones.
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
Catalytic <i>O</i>
- to <i>N</i>
-Alkyl Migratory Rearrangement: Transition Metal-Free Direct and Tandem Routes to <i>N</i>
-Alkylated Pyridones and Benzothiazolones
作者:Abhishek Kumar Mishra、Nelson Henrique Morgon、Suparna Sanyal、Aguinaldo Robinson de Souza、Srijit Biswas
DOI:10.1002/adsc.201800664
日期:2018.10.18
The present study reports the synthesis of N‐alkylated pyridones and benzothiazolones via O‐ to N‐alkyl group migration under transition metal‐free TfOH‐catalyzed reaction conditions for the first time, to the best of our knowledge. Primary as well as secondary alkyl groups smoothly migrate under the present reaction conditions. Moreover, a minor modification of the protocol used in this study is found
Chromium-Catalyzed Three-Component Synthesis of Monofluoroalkenes from <i>gem</i>-Difluoroalkenes via C–O/C–H and C–F Bond Activation
作者:Ya Xiong、Meiming Luo、Xiaoming Zeng
DOI:10.1021/acs.orglett.3c00979
日期:2023.5.5
We report here the chromium-catalyzed three-component defluorinative cross-couplings of gem-difluoroalkenes with benzyl 2-pyridinyl ethers and aryl Grignard reagents under mild conditions, enabling the convenient synthesis of diarylmethylated monofluoroalkenes in good chemo- and stereoselectivity.
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