Chemoselective Hydrosilylation of the α,β-Site Double Bond in α,β- and α,β,γ,δ-Unsaturated Ketones Catalyzed by Macrosteric Borane Promoted by Hexafluoro-2-propanol
作者:Xiao-Yu Zhan、Hua Zhang、Yu Dong、Jian Yang、Shuai He、Zhi-Chuan Shi、Lei Tang、Ji-Yu Wang
DOI:10.1021/acs.joc.0c00568
日期:2020.5.15
The B(C6F5)3-catalyzed chemoselective hydrosilylation of α,β- and α,β,γ,δ-unsaturated ketones into the corresponding non-symmetric ketones in mild reaction conditions is developed. Nearly 55 substrates including those bearing reducible functional groups such as alkynyl, alkenyl, cyano, and aromatic heterocycles are chemoselectively hydrosilylated in good to excellent yields. Isotope-labeling studies
Natural <font>α</font>-Amino Acid L-Lysine–Catalyzed Knoevenagel Condensations of <font>α</font>,<font>β</font>-Unsaturated Aldehydes and 1,3-Dicarbonyl Compounds
作者:Yan-Hong He、Ying Hu、Zhi Guan
DOI:10.1080/00397911.2010.490626
日期:2011.5.3
Abstract Knoevenagel condensations of α,β-unsaturated aldehydes and 1,3-dicarbonylcompounds were catalyzed by primary natural amino acid L-lysine. The reactions were carried out at room temperature in dimethylsulfoxide. It provides a facile entry to a wide variety of α,β,γ,δ-unsaturated dicarbonyl compounds. Supplemental materials are available for this article. Go to the publisher's online edition
Meldrum's Acids as Acylating Agents in the Catalytic Intramolecular Friedel−Crafts Reaction
作者:Eric Fillion、Dan Fishlock、Ashraf Wilsily、Julie M. Goll
DOI:10.1021/jo0483724
日期:2005.2.1
dialkyl thioether, aryl methyl ether, aryl TIPS and TBDPS ethers, nitrile- and nitro-substituted aryls, alkyl and aryl halides) for a variety of 5-benzyl (enolizable Meldrum's acids) and 5-benzyl-5-substituted Meldrum's acids (quaternized Meldrum's acids), forming 1-indanones and 2-substituted-1-indanones, respectively, are delineated. This method was further applied to the synthesis of 1-tetralones,
Palladium-Catalyzed Enantioselective Cycloaddition of Carbonylogous 1,4-Dipoles: Efficient Access to Chiral Cyclohexanones
作者:Barry M. Trost、Zhiwei Jiao
DOI:10.1021/jacs.0c11535
日期:2020.12.30
A novel palladium-mediated carbonylogous 1,4-dipole was developed by in situ deprotonation. By using our own-developed C2-unsymmetric phosphoramidite as supporting ligand, this dipole was applied to the asymmetric synthesis of chiral cyclohexanones via a catalytic [4+2] cycloaddition. Electron-deficient allyliccarbonate was used to generate the highly reactive palladium-mediated dipoles for the first
ANTICANCER 1,3-DIOXANE-4,6-DIONE DERIVATIVES AND METHOD OF COMBINATORIAL SYNTHESIS THEREOF
申请人:National Guard Health Affairs
公开号:US20200290975A1
公开(公告)日:2020-09-17
Compounds, methods of synthesis, and methods of cancer treatment by arylidene-1,3-dioxane-4,6-diones. A Meldrum's acid-based chemistry and hybrid solid-liquid method. The method includes protection of ketone and aldehyde components and simultaneous immobilization on the solid phase, introduction of substituents, grafts and derivatives compatible with the protection, detachment and restoration of active carbonyl reactivity, reaction of ketone library with malonate, reacting of the products with the aldehyde library in liquid phase and separation of the products by preparative HPLC.