Iron-Facilitated Oxidative Radical Decarboxylative Cross-Coupling between α-Oxocarboxylic Acids and Acrylic Acids: An Approach to α,β-Unsaturated Carbonyls
The first Fe-facilitated decarboxylative cross-coupling reaction between α-oxocarboxylicacids and acrylic acids in aqueous solution has been developed. This transformation is characterized by its wide substrate scope and good functional group compatibility utilizing inexpensive and easily accessible reagents, thus providing an efficient and expeditious approach to an important class of α,β-unsaturated
Heterogeneous catalytic 1,4-addition of arylmagnesium compounds to chalcones
作者:Kinga Juhász、Zoltán Hell
DOI:10.1016/j.tetlet.2018.07.016
日期:2018.8
Copper(II) on a 4 Å molecular sieve support catalyses the chemoselective addition of alkyl- and arylmagnesiumhalides to chalcones. Only the 1,4-addition products were obtained in high yields.
Gold(I)-Catalyzed Decarboxylation of Propargyl Carbonates: Reactivity Reversal of the Gold Catalyst from<i>π</i>-Lewis Acidity to<i>σ</i>-Lewis Acidity
A cationic gold(I)‐catalyzed decarboxylative etherification of propargylcarbonates to selectively produce propargyl ethers is reported. In the reaction the gold(I) catalyst shows a distinct σ‐Lewis acidity rather than the commonly observed π‐Lewis acidity, and thus catalyzes the decarboxylation of a variety of propargylcarbonates to give the corresponding propargyl ethers with high selectivity. This
A transition metal-free α,β-dehydrogenation of ketones and aldehydes was developed. This reaction was conducted in a facile I2/KI/DMSO system to produce the corresponding unsaturatedcompounds in good to high yields. The gram-scale experiment also indicated the potential synthetic value of this new reaction in organic synthesis. In the reaction, DMSO acted as both solvent and mild oxidant.
研究了酮和醛的无过渡金属α,β-脱氢反应。该反应在容易的I 2 / KI / DMSO系统中进行,以高至高收率生产相应的不饱和化合物。克级实验还表明了这种新反应在有机合成中的潜在合成价值。在反应中,DMSO既充当溶剂又充当弱氧化剂。
Studies of NMR Chemical Shifts of Chalcone Derivatives of Five‐membered Monoheterocycles and Determination of Aromaticity Indices
作者:Eun Jeong Jeong、In‐Sook Han Lee
DOI:10.1002/bkcs.11749
日期:2019.7
(E)‐1‐heteroaryl‐3‐arylpropen‐1‐ones. The 13C chemicalshift values (δC) of the chalcone derivatives were determined in order to find if they correlated with the Hammett σ values. A good correlation, especially for the β‐C for both series, was found for the 13C chemicalshift values (δC) of the chalcone derivatives with the Hammett σ values. The chemicalshift values of the β‐C of the heterocyclic compounds