The bis-1,4-dimesityl-1,2,3-triazol-5-ylidene–palladium complex (1a) successfully catalyzes the Mizoroki–Heck and Sonogashira coupling reactions with aryl bromides to give the corresponding alkenes and alkynes, respectively, in good to excellent yields. In the Mizoroki–Heck reaction, electron-rich, electron-poor, and functionalized aryl bromides and alkenes are tolerated, while the substrates are limited
Synthesis and Characterization of Pentaerythritol-Derived Oligoglycol and Their Application to Catalytic Wittig-Type Reactions
作者:Kai Li、Li Ran、Yi-Hua Yu、Yong Tang
DOI:10.1021/jo049701v
日期:2004.5.1
approach. Quantitative 13C NMR proves to be an efficient tool for the characterization of oligoglycols. The corresponding telluride of oligoglycol 17 is synthesized and used as a good catalyst for Wittig-typereactions in preparing both disubstituted and trisubstituted οlefins in good to high yields.
几种具有游离羟基的季戊四醇衍生的低聚乙二醇1可以通过收敛方法容易地制备。定量13 C NMR被证明是表征低聚乙二醇的有效工具。合成了相应的低聚乙二醇17的碲化物,并将其用作Wittig型反应的良好催化剂,以高收率或高收率制备二取代和三取代的烯烃。
Cinnamoyl Inhibitors of Tissue Transglutaminase
作者:Christophe Pardin、Joelle N. Pelletier、William D. Lubell、Jeffrey W. Keillor
DOI:10.1021/jo8004843
日期:2008.8.1
inhibitors of guinea pig liver transglutaminase. The most effective inhibitors evaluated can be sorted into two subclasses: substituted cinnamoyl benzotriazolyl amides and the 3-(substituted cinnamoyl)pyridines, referred to more commonly as azachalcones. Kinetic evaluation of both of these subclasses revealed that they display reversible inhibition and are competitive with acyldonor TGase substrates at IC50
P[N(<i>i-</i>Bu)CH<sub>2</sub>CH<sub>2</sub>]<sub>3</sub>N: Nonionic Lewis Base for Promoting the Room-Temperature Synthesis of α,β-Unsaturated Esters, Fluorides, Ketones, and Nitriles Using Wadsworth−Emmons Phosphonates
作者:Venkat Reddy Chintareddy、Arkady Ellern、John G. Verkade
DOI:10.1021/jo1012515
日期:2010.11.5
serves as an effective promoter for the room-temperature stereoselective synthesis of α,β-unsaturated esters, fluorides, and nitriles from a wide array of aromatic, aliphatic, heterocyclic, and cyclic aldehydes and ketones, using a range of Wadsworth−Emmons (WE) phosphonates. Among the analogues of 1c [R = Me (1a), i-Pr (1b), Bn (1d)], 1a and 1b performed well, although longer reaction times were involved
Rhodium-Catalyzed Heck-Type Coupling of Boronic Acids with Activated Alkenes in an Aqueous Emulsion
作者:Mark Lautens、John Mancuso、Harpreet Grover
DOI:10.1055/s-2004-829161
日期:——
Intermolecular couplings between arylboronic acids and activated alkenes catalyzed by a water-soluble tert-butyl amphosrhodium complex were found to progress at room temperature and generated Heck-type products with high yields and excellent selectivity. Substitution on the alkene component encouraged the formation of products arising from a conjugate addition-protonation process. In the case of Heck