Visible-Light-Mediated Utilization of α-Aminoalkyl Radicals: Addition to Electron-Deficient Alkenes Using Photoredox Catalysts
摘要:
Synthetic use of alpha-aminoalkyl radicals formed by single electron oxidation of amines is quite limited. Here we demonstrate addition of alpha-aminoalkyl radicals to electron-deficient alkenes by visible-light-mediated electron transfer using transition metal polypyridyl complexes as photocatalysts, via a sequential redox pathway.
Triaminophosphine ligands for carbon-nitrogen and carbon-carbon bond formation
申请人:Iowa State University Research Foundation, Inc.
公开号:US07385058B1
公开(公告)日:2008-06-10
Methods and compounds are provided for the formation of carbon-nitrogen or carbon-carbon bonds comprising reacting an amine or an aryl boronic acid with an aryl halide in the presence of a palladium catalyst, a base, and a compound of formula II:
The compound of formula (8), in racemic or single enantiomeric form, is useful in making N-(diphenylmethyl)-piperazines such as cetirizine and levocetrizine.
wherein Z is preferably phenyl.
Application of a New Bicyclic Triaminophosphine Ligand in Pd-Catalyzed Buchwald−Hartwig Amination Reactions of Aryl Chlorides, Bromides, and Iodides
作者:Sameer Urgaonkar、Ju-Hua Xu、John G. Verkade
DOI:10.1021/jo034994y
日期:2003.10.1
The new bicyclic triaminophosphine ligand P(i-BuNCH2)3CMe (3) has been synthesized in three steps from commercially available materials and its efficacy in palladium-catalyzed reactions of aryl halides with an array of amines has been demonstrated. Electron-poor, electron-neutral, and electron-rich aryl bromides, chlorides, and iodides participated in the process. The reactions encompassed aromatic
新的双环三氨基膦配体P(i-BuNCH2)3CMe(3)由市售材料分三步合成,并已证明其在钯催化的芳基卤化物与一系列胺反应中的功效。贫电子,中性电子和富电子芳基溴化物,氯化物和碘化物参与了该过程。反应包括芳族胺(伯或仲)和仲胺(环或无环)。还显示出弱碱Cs 2 CO 3可以与配体3一起使用,从而允许在我们的胺化方案中使用多种官能化的底物(例如,那些含有酯和硝基的底物)。该配体为芳基碘化物的胺化提供了一种非常普通,有效和温和的钯催化剂。尽管3对空气和湿气比较敏感,可以采用简单的程序来避免使用手套箱。比较3在这些反应中与前氮杂磷杂环戊烷P(i-BuNCH2CH2)3N的功效(2)显示,除了2中有转环的机会(但3中没有),这两者之间还存在其他明显的立体电子对比有助于解释Pd / 2和Pd / 3催化体系活性差异的配体。
[EN] AN IMPROVED PROCESS FOR THE PREPARATION OF ANTIHISTAMINIC DRUGS VIA A NOVEL CARBAMATE INTERMEDIATE<br/>[FR] PROCÉDÉ DE PRÉPARATION AMÉLIORÉ D'ANTIHISTAMINIQUES FAISANT APPEL À UN NOUVEL INTERMÉDIAIRE CARBAMATE
申请人:JUBILANT LIFE SCIENCES LTD
公开号:WO2012101475A1
公开(公告)日:2012-08-02
The present invention relates to a novel racemic or optically active carbamate intermediate of formula (IV A). This novel racemic or optically active carbamate intermediate of formula (IV A) can be used to prepare drugs having antihistaminic activity such as cetirizine (IA), meclizine (IB), chlorcyclizine (IC), clocinizine (ID), buclizine (IE) and enantiomers thereof such as levocetirizine (I). Further, disclosed herein is an improved process for the preparation of levocetirizine via a novel optically active intermediate i.e. compound of formula (IV). Also, disclosed herein is a novel process for the preparation of compound (II) and for crystallization of its salt.
Highly Chemoselective Iridium Photoredox and Nickel Catalysis for the Cross-Coupling of Primary Aryl Amines with Aryl Halides
作者:Martins S. Oderinde、Natalie H. Jones、Antoine Juneau、Mathieu Frenette、Brian Aquila、Sharon Tentarelli、Daniel W. Robbins、Jeffrey W. Johannes
DOI:10.1002/anie.201604429
日期:2016.10.10
visible‐light‐promoted iridium photoredox and nickel dual‐catalyzedcross‐coupling procedure for the formation C−N bonds has been developed. With this method, various aryl amines were chemoselectively cross‐coupled with electronically and sterically diverse aryl iodides and bromides to forge the corresponding C−N bonds, which are of high interest to the pharmaceutical industries. Aryl iodides were found to be a more