Heck reaction of β-substituted acrylates in ionic liquids catalyzed by a Pd-benzothiazole carbene complex
作者:Vincenzo Calò、Angelo Nacci、Antonio Monopoli、Luigi Lopez、Anna di Cosmo
DOI:10.1016/s0040-4020(01)00528-2
日期:2001.7
A Pd-catalyst with benzothiazole carbene as ligands allows, in tetrabutylammonium bromide melt as solvent, very fast and efficient reactions of haloaromatics with beta -substituted acrylates. (C) 2001 Elsevier Science Ltd. All rights reserved.
Heck Reactions with Palladium Nanoparticles in Ionic Liquids: Coupling of Aryl Chlorides with Deactivated Olefins
Smooth operators: Heck reactions of aryl chlorides were catalyzed by ligand‐free palladium acetate in a molten mixture of tetraalkylammonium ionic liquids under aerobic and relatively mild conditions (see example). Deactivated electron‐rich aryl chlorides reacted with a wide array of substituted alkenes under these conditions, which thus enabled the coupling of combinations of substrates that are commonly
A variety of functionalized coumarins were synthesized from substituted phenylacrylic acids via PIDA/I2-mediated and irradiation-promoted oxidative carbon–oxygen bond formation. Our studies show that the oxygen in the pendant carboxylic acid group cyclizes favorably to the aryl ring that is cis to it. The main advantages of this method include good functional group tolerance and the transition-metal-free
通过PIDA / I 2介导的和辐射促进的氧化碳-氧键形成,由取代的苯基丙烯酸合成了多种功能化的香豆素。我们的研究表明,羧酸侧基中的氧有利地环化成顺式的芳基环。该方法的主要优点包括良好的官能团耐受性和无过渡金属的特性。