9-(Diphenylphosphino)anthracene-based phosphapalladacycle catalyzed conjugate addition of arylboronic acids to electron-deficient alkenes
作者:Minori Shimizu、Tetsuya Yamamoto
DOI:10.1016/j.tetlet.2020.152257
日期:2020.8
9-(Diphenylphosphino)anthracene-based phosphapalladacycle catalyzed conjugateaddition of arylboronic acids to electron-deficient alkenes such asα,β-unsaturated ketones, esters, nitrile and nitroalkenes gave corresponding β-arylated alkanes in good yields and achieved TON up to 700.
Copper complexes of phosphoramidites efficiently catalyzed asymmetricaddition of arylboron reagents to acyclic enones. Importantly, rare 1,4-insertion of arylcopper(I) was identified which led directly to O-bound copper enolates. The new mechanism is fundamentally different from classical oxidative addition/reductive elimination of organocopper(I) on enones.
亚磷酰胺的铜配合物有效地催化芳基硼试剂向无环烯酮的不对称加成。重要的是,鉴定了稀有的芳基铜(I)的 1,4-插入,这直接导致了与 O 结合的铜烯醇化物。新机制与传统的有机铜(I)在烯酮上的氧化加成/还原消除有着根本的不同。
Direct functionalization of benzylic C–Hs with vinyl acetates via Fe-catalysis
作者:Chun-Xiao Song、Gui-Xin Cai、Thomas R. Farrell、Zhong-Ping Jiang、Hu Li、Liang-Bing Gan、Zhang-Jie Shi
DOI:10.1039/b911031c
日期:——
Direct cross-coupling to construct sp3 Câsp3C bonds viaFe-catalyzed benzylic CâH activation with 1-aryl vinyl acetate was developed.
Conjugateaddition of α,β-unsaturated ketones with arylzinc species that form in situ from diethylzinc and a series of arylboronic acids by boron-zinc exchange reactions were investigated. 1,4-Addition products were formed in yields of 34-93%.
Stable and Reusable Palladium Nanoparticles-Catalyzed Conjugate Addition of Aryl Iodides to Enones: Route to Reductive Heck Products
作者:Naziya Parveen、Rajib Saha、Govindasamy Sekar
DOI:10.1002/adsc.201700823
日期:2017.11.10
efficient, binaphthyl‐backbone‐stabilized palladium nanoparticles (Pd‐BNP) catalyst for the 1,4‐addition of aryl halides to enones has been developed. The scope of the reaction has been studied with various substituted and sterically hindered aryl halides and enones to afford the conjugate additionproducts in good to excellent yields. The catalyst has been recovered and reused up to five times without