Efficient and selective alkylation of arenes and heteroarenes with benzyl and allyl ethers using a Ir/Sn bimetallic catalyst
作者:Susmita Podder、Sujit Roy
DOI:10.1016/j.tet.2007.06.068
日期:2007.9
A high-valent heterobimetallic catalyst namely [Ir2(COD)2(SnCl3)2(Cl)2(μ-Cl)2] (5 mol %), or dual catalyst system of [Ir(COD)Cl]2 (1 mol %) and SnCl4 (4 mol %), promotes the benzylation or allylation of arenes and heteroarenes using ethers as the alkylating agents. An electrophilic mechanism is proposed from a Hammett correlation.
In the presence of catalytic amounts of cationic thiolate-bridged
diruthenium complexes, arenes react with allylic alcohols to afford the
corresponding allylated aromatic products in high yields.
在阳离子硫醇盐桥连二钌复合物的催化量存在下,芳烃与烯丙醇反应,以高产率得到相应的烯丙基化芳香产物。
Molybdenum- and Tungsten-Catalyzed Allylation of Aromatic Compounds with Allylic Esters and Alcohols
A novel method to substitute aromaticcompounds with allylic groups using oxygen-containing allylic compounds in the presence of molybdenum or tungsten carbonyls under neutral conditions has been developed. The method is applicable to one step synthesis of methyl eugenol.
Iron Oxide Nanoparticles Grown on Carboxy-Functionalized Graphite: An Efficient Reusable Catalyst for Alkylation of Arenes
作者:Vikul Rajpara、Subhash Banerjee、Grigoriy Sereda
DOI:10.1055/s-0029-1218851
日期:2010.8
hybrid catalyst by growing iron oxide nanoparticles on carboxy-functionalized graphite. This hybrid catalyst demonstrated superior catalytic activity towards the alkylation of arenes with alkyl halides in contrast to commercial graphite or unsupported iron oxide nanoparticles in terms of yields and general applicability. The catalyst can be reused up to five times with a minimal loss of catalytic activity
AgOTf is an effective catalyst for intermolecular allylation of aromatic and heteroaromatic compounds with allylic alcohols affording allylated arenes in up to 99% yields. Heterogeneous allylation of arenes catalyzed by Ag3PW12O40 gave comparable product yields to those obtained by AgOTf. Ag3PW12O40 could be reused five times with slightly decreased activity.