[EN] PROCESSES FOR THE PREPARATION OF ORTHO-ALLYLATED HYDROXY PHENYL COMPOUNDS [FR] PROCÉDÉS DE PRÉPARATION DE COMPOSÉS HYDROXYPHÉNYLE ORTHO-ALLYLÉS
摘要:
The present application describes process for preparing an ortho-allylated hydroxy aryl compounds such as compounds of Formula (I) by reacting an allylic alcohol with a hydroxy aryl compound in the presence of aluminum compound selected from alumina and aluminum alkoxides and in a non-protic solvent wherein at least one carbon atom ortho to the hydroxy group in the hydroxy aryl compound is unsubstituted.
Simple salts of abundant metals (Fe, Bi, and Ti) supported on montmorillonite as efficient and recyclable catalysts for regioselective intramolecular and intermolecular hydroalkoxylation reactions of double bonds and tandem processes
conditions has been studied using two types of solid catalysts, namely montmorillonite (MMT) doped with metal cations and metal nanoparticles supported on oxides. In the case of intramolecular reactions, 38–99% yields of cyclic ethers have been obtained using Fe-MMT and Bi-MMT both in CH3NO2 and dimethyl carbonate (DMC) compared with other supported metal salts or metal nanoparticles. In the case of more challenging
已经使用两种类型的固体催化剂,即掺杂有金属阳离子的蒙脱石(MMT)和负载在氧化物上的金属纳米颗粒,研究了烯烃的催化加氢烷氧基化反应从均相转化为非均相条件的过程。在分子内反应的情况下,在CH 3 NO 2中使用Fe-MMT和Bi-MMT均可获得38-99%的环状醚收率碳酸二甲酯(DMC)与其他负载型金属盐或金属纳米粒子相比。在更具挑战性的分子间反应的情况下,使用金属掺杂的MMT(例如Fe-,Bi-和Ti-MMT)也可以获得高达72%的转化率和高达54%的产率。在本文中,我们详细介绍了被识别为真正异质催化过程的底物范围和限制,适用于两类反应和串联过程,它们在流动中的移位以及有关活性物质的一些机理见解。作为一般趋势,观察到三取代的双键在分子内和分子间反应中均能获得最佳结果。在Fe-MMT和Bi-MMT的情况下,均相催化剂成功转移到非均相催化剂上,在Bi-MMT的情况下,甚至可以提高催化活性。
scantly investigated. We present a selective and generally applicable concept of chlorination-induced polyenecyclization by utilizing HFIP–chloroiodane networks mimicking terpene cyclases. A manifold of different alkenes was converted with excellent selectivities (up to d.r. >95 : 5). The cyclization platform was even extended to several structurally challenging terpenes and terpenoid carbon frameworks
虽然最近成功实施了溴环化和碘环化,但很少研究具有挑战性的氯环化。我们通过利用模拟萜烯环化酶的 HFIP-氯碘烷网络提出了一种选择性且普遍适用的氯化诱导多烯环化概念。多种不同烯烃的转化具有出色的选择性(高达 dr >95 : 5)。环化平台甚至扩展到几个结构上具有挑战性的萜烯和萜类碳骨架。
Study and Applications of Tetrasubstituted Hypervalent Selenium–Halogen Species in Catalytic Electrophilic Halogenations
作者:Junjie Yang、Yung-Yin Chan、Weida Feng、Ying-Lung Steve Tse、Ying-Yeung Yeung
DOI:10.1021/acscatal.2c05414
日期:2023.2.17
Electrophilic halogenation reactions are highly useful in various areas. N-Haloamides are commonly used as halogen sources because of high stability and commercial availability. In order to activate N-haloamides, Lewis basic chalcogens are commonly used as catalysts to site-isolate the strongly coordinating amide moieties. However, the corresponding trisubstituted chalcogenonium–halogen cationic intermediate
[EN] PROCESSES FOR THE PREPARATION OF ORTHO-ALLYLATED HYDROXY PHENYL COMPOUNDS<br/>[FR] PROCÉDÉS DE PRÉPARATION DE COMPOSÉS HYDROXYPHÉNYLE ORTHO-ALLYLÉS
申请人:[en]MCMASTER UNIVERSITY
公开号:WO2022266765A1
公开(公告)日:2022-12-29
The present application describes process for preparing an ortho-allylated hydroxy aryl compounds such as compounds of Formula (I) by reacting an allylic alcohol with a hydroxy aryl compound in the presence of aluminum compound selected from alumina and aluminum alkoxides and in a non-protic solvent wherein at least one carbon atom ortho to the hydroxy group in the hydroxy aryl compound is unsubstituted.