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.
Phenanthrenequinone (PQ) catalyzed cross-dehydrogenative coupling of alkanes with quinoxalin-2(1<i>H</i>)-ones and simple N-heteroarenes under visible light irradiation
作者:Min Wang、Yicheng Zhang、Xinyu Yang、Peipei Sun
DOI:10.1039/d2ob00278g
日期:——
A convenient strategy for alkylation of quinoxalin-2(1H)-ones and other N-heterocycles with simple alkanes using phenanthrenequinone (PQ) as a photocatalyst has been developed.
Decarbonylative C3‐Alkylation of Quinoxalin‐2(1
<i>H</i>
)‐Ones with Aliphatic Aldehydes via Photocatalysis
作者:Min Wang、Jie Liu、Yicheng Zhang、Peipei Sun
DOI:10.1002/adsc.202200455
日期:2022.8.2
AbstractA strategy to synthesize 3‐alkyl quinoxalin‐2(1H)‐ones and other alkyl N‐heteroarenes via a photocatalyzed decarbonylative alkylation of quinoxalin‐2(1H)‐ones and simple N‐heterocycles with commercially available aliphatic aldehyde under ambient conditions using phenanthrenequinone as a photocatalyst was developed. In this transformation, various 3‐alkyl quinoxalin‐2(1H)‐ones and other alkyl N‐heteroarenes were generated in 58–87% isolated yields with good functional‐group tolerance.magnified image
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