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.
A specific N-alkylation of 2-hydroxypyridines is achieved by reacting with organohalides under catalyst- and base-free conditions. The observed HX-facilitated conversion of pyridyl ether intermediates to 2-pyridone products may account for the success and specific N-alkylation of the reaction under the unexpectedly simple conditions. This new reaction may provide a useful alternative for the synthesis of 2-pyridones and analogous structures because of its >99% N-selectivity, relatively broad scopes of both substrates, and no mandatory use of catalysts and bases.
[EN] NOVEL HIGH AFFINITY QUINOLINE-BASED KINASE LIGANDS<br/>[FR] NOUVEAUX LIGANDS DE KINASES A BASE DE QUINOLINE A AFFINITE ELEVEE
申请人:SCHERING CORP
公开号:WO2007022241A2
公开(公告)日:2007-02-22
[EN] Quinoline-based inhibitors of cyclin dependent kinase 2, compositions including the inhibitors, and methods of using the inhibitors and inhibitor compositions are described. The inhibitors and compositions including them are useful for treating disease or disease symptoms. The invention also provides for methods of making CDK-2 inhibitor compounds, methods of inhibiting CDK-2, and methods for treating disease or disease symptoms. [FR] L'invention concerne des inhibiteurs de la kinase 2 dépendant des cyclines à base de quinoline, des compositions comprenant ces inhibiteurs et des procédés d'utilisation des inhibiteurs et des compositions d'inhibiteurs. Ces inhibiteurs et les compositions comprenant ceux-ci sont utiles pour traiter une maladie ou des symptômes pathologiques. L'invention concerne aussi des procédés de fabrication de composés d'inhibiteurs de la CDK-2, de procédés d'inhibition de la CDK-2 et des méthodes de traitement d'une maladie ou de symptômes pathologiques.
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