Photocatalytic Intramolecular C–H Amination Using <i>N</i>-Oxyureas as Nitrene Precursors
作者:Ryan A. Ivanovich、Dilan E. Polat、André M. Beauchemin
DOI:10.1021/acs.orglett.0c02200
日期:2020.8.21
Nitrenes are remarkable high-energy chemical species that enable direct C–N bond formation, typically via controlled reactions of metal-stabilized nitrenes. Here, in contrast, the combined use of photocatalysis with careful engineering of the precursor enabled C–H amination forming imidazolidinones and related nitrogen heterocycles from readily accessible hydroxylamine precursors. Preliminary mechanistic
[EN] PYRAZOLOPYRIMIDINE DERIVATIVES, PREPARATION METHOD THEREOF, AND PHARMACEUTICAL COMPOSITION FOR USE IN PREVENTING OR TREATING CANCER, AUTOIMMUNE DISEASE AND BRAIN DISEASE CONTAINING THE SAME AS AN ACTIVE INGREDIENT<br/>[FR] DÉRIVÉS DE PYRAZOLOPYRIMIDINE, LEUR PROCÉDÉ DE PRÉPARATION ET COMPOSITION PHARMACEUTIQUE POUR UTILISATION DANS LA PRÉVENTION OU LE TRAITEMENT DU CANCER, D'UNE MALADIE AUTO-IMMUNE ET D'UNE MALADIE DU CERVEAU CONTENANT CEUX-CI EN TANT QUE PRINCIPE ACTIF
申请人:KOREA RES INST CHEMICAL TECH
公开号:WO2018208132A1
公开(公告)日:2018-11-15
The present invention relates to a pyrazolopyrimidine derivative, a preparation method thereof and a pharmaceutical composition comprising the same as an active ingredient for the prevention or treatment of cancer, autoimmune disease and brain disease. The pyrazolopyrimidine derivative of the present invention exhibits excellent Bruton's tyrosine kinase inhibition activity, so that it can be effectively used as a pharmaceutical composition for the prevention or treatment of cancer, autoimmune disease and Parkinson's disease.
<scp>Iron‐Catalyzed</scp>
Intramolecular C—H Amidation of
<scp>
<i>N</i>
‐Benzoyloxyureas
</scp>
作者:Dayou Zhong、Lin‐Yang Wu、Xing‐Zhen Wang、Wen‐Bo Liu
DOI:10.1002/cjoc.202100005
日期:2021.4
A redox‐neutral Fe‐catalyzed intramolecular C—H amidation of N‐benzoyloxyureas is described. This methodology employs a simple iron complex in situ generated from Fe(OTf)2 and bipyridine as the catalyst and N‐benzoyloxyureas as the nitrene precursors without using exogenous oxidants. An array of cyclic ureas were synthesized via aliphatic C(sp3)—H amidation in excellent yields. In addition, this catalytic
Cesium Effect: High Chemoselectivity in Direct N-Alkylation of Amines
作者:Ralph Nicholas Salvatore、Advait S. Nagle、Kyung Woon Jung
DOI:10.1021/jo010643c
日期:2002.2.1
A novel method for the mono-N-alkylation of primary amines, diamines, and polyamines was developed using cesium bases in order to prepare secondaryamines efficiently. A cesium base not only promoted alkylation of primary amines but also suppressed overalkylations of the produced secondaryamines. Various amines, alkyl bromides, and alkyl sulfonates were examined, and the results demonstrated this
The present disclosure provides substituted pyridyl-, pyrimidinyl-, pyrazinyl-, pyridazinyl-, and triazinyl-based carboxamides of Formula I-A: R
10
Z-HET-E I-A and the pharmaceutically acceptable salts and solvates thereof, wherein Z, HET, R
10
and E are defined as set forth in the specification. The present disclosure is also directed to the use of compounds of Formula I-A to treat a disorder responsive to the blockade of sodium channels. Compounds of the present disclosure are especially useful for treating pain.