Ligand-Free Reusable Palladium-Catalyzed Heck-Type Coupling Reactions of Hypervalent Iodine Reagents under Mild Conditions
作者:Xiaoming Qu、Peng Sun、Tingyi Li、Jincheng Mao
DOI:10.1002/adsc.201100008
日期:2011.5.9
Highly effective palladium‐catalyzed Heck‐type couplings of hypervalentiodinereagents are reported for the first time. It is noteworthy that such reactions could be carried out in the absence of ligand at 40 °C and the catalytic system could be easily reused for five times.
The stereoselectivesynthesis of trisubstitutedalkenescontaining a benzyl substituent has been achieved by employing Friedel-Craft reaction of aromatic compounds with unactivated Baylis-Hillmanadducts in the presence of Fe 3 + -K-10 montmorillonite clay as a heterogeneous catalyst. The catalyst can be recovered and reused.
在 Fe 3 + -K-10 蒙脱石粘土作为非均相催化剂存在下,通过使用芳族化合物与未活化的 Baylis-Hillman 加合物的 Friedel-Craft 反应,实现了含有苄基取代基的三取代烯烃的立体选择性合成。催化剂可以回收再利用。
Copper-Catalyzed α-Benzylation of Enones via Radical-Triggered Oxidative Coupling of Two C–H Bonds
A novel copper(II)-catalyzed, regioselective C-H benzylation of enones with toluenes via radical triggered oxidative coupling has been developed. A series of enones and toluenes with different substituents were successfully incorporated, providing a wide range of alpha-benzylated enones with TBP as oxidant by cleavage of C(sp(3)) H bond and C(sp(2)) H bond. Preliminary mechanistic study reveals a benzylic carbon radical is generated, and regioselectively reacts with enones to deliver the corresponding products.
Thianthrenation-promoted photoinduced alkene difunctionalization and aryl allylation with Morita–Baylis–Hillman adducts
作者:Biplab Mondal、Ayan Chatterjee、Nitis Chandra Saha、Manoranjan Jana、Jaideep Saha
DOI:10.1039/d4cc01792g
日期:——
An organophotoredox-catalyzed alkoxyallylation of feed-stock olefins, through thianthrenation using a Morita–Baylis–Hillman adduct as an allylating agent, is described.