Synthesis of 1,2-disubstituted acetylenes via copper-catalyzed Suzuki coupling of organoboronic acids with 1,1-dibromo-1-alkenes
摘要:
An efficient synthesis of 1,2-disubstituted acetylenes has been described. Reactions of organoboronic acids with 1,1-dibromo-1-alkenes in the presence of a catalytic amount of Cul (10 mol %), 8-hydroxyquinoline (10 mol %), and using potassium phosphate as base in C2H5OH afforded the desired 1,2-disubstituted acetylenes in good to excellent yields. It is important to note that the formation of 1,3-diynes, which are derived from the homocoupling of 1,1-dibromo-1-alkenes, can be almost completely suppressed under these optimized conditions. (c) 2012 Elsevier Ltd. All rights reserved.
decarbonylative Sonogashira coupling of terminalalkynes with carboxylic acids was achieved through palladium catalysis. This reaction did not use overstoichiometric oxidants, thus overcoming the homocoupling issue of terminalalkynes. Under the reaction conditions, a wide range of carboxylic acids including those bioactive ones could couple readily with various terminalalkynes, thus providing a relative general
Macrocyclic hepatitis C serine protease inhibitors
申请人:Miao Zhenwei
公开号:US20050153877A1
公开(公告)日:2005-07-14
The present invention relates to compounds of Formula I, II or Ill, or a pharmaceutically acceptable salt, ester, or prodrug, thereof:
wherein W is a substituted or unsubstituted heterocyclic ring system. The compounds inhibit serine protease activity, particularly the activity of hepatitis c virus (HCV) NS3-NS4A protease. Consequently, the compounds of the present invention interfere with the life cycle of the hepatitis c virus and are also useful as antiviral agents. The present invention further relates to pharmaceutical compositions comprising the aforementioned compounds for administration to a subject suffering from HCV infection. The invention also relates to methods of treating an HCV infection in a subject by administering a pharmaceutical composition comprising the compounds of the present invention.
Cleavage of Carbon–Carbon Triple Bond: Direct Transformation of Alkynes to Nitriles
作者:Noriko Okamoto、Minoru Ishikura、Reiko Yanada
DOI:10.1021/ol401311h
日期:2013.6.7
A new cleavage reaction of carbon–carbon triple bonds proceeds efficiently with NIS and TMSN3, giving the corresponding nitriles in moderate to good yields.
NIS和TMSN 3可以有效地进行碳-碳三键的新裂解反应,从而以中等至良好的产率获得相应的腈。
LiHMDS-Promoted Palladium-Catalyzed Sonogashira Cross-Coupling of Aryl Fluorides with Terminal Alkynes
作者:Jingjing He、Kang Yang、Jianhong Zhao、Song Cao
DOI:10.1021/acs.orglett.9b03815
日期:2019.12.6
A highly efficient Pd-catalyzed Sonogashira coupling of various aryl fluorides with terminalalkynes in the presence of LiHMDS was developed. Both unreactive electron-rich fluoroarenes and electron-poor fluoroarenes proceeded smoothly and afforded the corresponding internalalkynes in moderate to excellent yields.
Highly Active Palladium Catalyst for the Sonogashira Coupling Reaction of Unreactive Aryl Chlorides
作者:Dong-Hwan Lee、Young-Jun Kwon、Myung-Jong Jin
DOI:10.1002/adsc.201100747
日期:2011.11
communication reports on the β-diketiminatophosphane palladium-catalyzed copper-free Sonogashira coupling of arylchlorides with alkynes. A catalyst loading of 0.5 mol% is sufficient to achieve high performance under relatively mild reaction conditions. Furthermore, dialkynylbenzenes are efficiently prepared by one-pot double Sonogashira couplings of aryl dichlorides.