Palladium-Catalyzed Coupling of Ammonia with Aryl Chlorides, Bromides, Iodides, and Sulfonates: A General Method for the Preparation of Primary Arylamines
作者:Giang D. Vo、John F. Hartwig
DOI:10.1021/ja903049z
日期:2009.8.12
for the coupling of ammonia with aryl chlorides, bromides, iodides, and sulfonates. The couplings of ammonia with this catalyst conducted with a solution of ammonia in dioxane form primary arylamines from a variety of aryl electrophiles in high yields. Catalyst loadings as low as 0.1 mol % were sufficient for reactions of many aryl chlorides and bromides. In the presence of this catalyst, aryl sulfonates
Cycling between Au(i) and Au(iii) is challenging, so gold-catalyzed cross-couplings are rare. The (MeDalphos)AuCl complex, which we showed was prone to undergo oxidative addition, is reported here to efficiently catalyze the C-N coupling of aryl iodides and amines. The transformation does not require an externaloxidant or a directing group. It is robust and works with a wide scope of aryl iodides
Ligand-Free Copper-Manganese Spinel Oxide-Catalyzed Tandem One-Pot C-H Amidation and<i>N</i>-Arylation of Benzylamines: A Facile Access to 2-Arylquinazolin-4(3<i>H</i>)-ones
作者:Rohit Sharma、Ram A. Vishwakarma、Sandip B. Bharate
DOI:10.1002/adsc.201600549
日期:2016.10.6
An efficient ligand‐free copper‐manganese (Cu‐Mn) spinel oxide‐catalyzed direct tandem C−H oxygenation and N‐arylation of benzylamines has been developed. The method has been utilized for the synthesis of medicinally important 2‐arylquinazolin‐4(3H)‐ones. Salient features of this method include recyclable catalyst, no ligand, excellent product yields, shorter reaction times and a broad substrate scope
Palladium-Imidazolium<i>N</i>-Heterocyclic Carbene-Catalyzed Carbonylative Amidation With Boronic Acids, Aryl Diazonium Ions, and Ammonia
作者:Merritt B. Andrus、Yudao Ma、Chun Song、Qiang Chai、Changqin Ma
DOI:10.1055/s-2003-42478
日期:——
tetrafluoroborates have been coupled with arylboron compounds, carbon monoxide, and ammonia to give aryl amides in high yields. A saturated N-heterocyclic carbene (NHC) ligand, H 2 IPr was used with palladium(II) acetate to give the active catalyst. A mechanism is proposed for this novel four-component couplingreaction.
芳基重氮四氟硼酸盐已与芳基硼化合物、一氧化碳和氨偶联,以高收率得到芳基酰胺。将饱和的 N-杂环卡宾 (NHC) 配体 H 2 IPr 与乙酸钯 (II) 一起使用以得到活性催化剂。为这种新颖的四组分偶联反应提出了一种机制。
Novel benzothiazole and antirheumatic agent comprising it as an active
申请人:Kanebo Ltd.
公开号:US04910211A1
公开(公告)日:1990-03-20
A benzothiazole of the following formula ##STR1## in which R represents a methyl, methoxy, carboxyl or methoxycarbonyl group. The compound is useful for treating rheumatic arthritis.