Towards assembling of diarylmethine unit present in biologically important molecules, we have developed a new Weinreb Amide (WA) basedbuildingblock, derived from glycolic acid. The WA functionality present in this buildingblock had allowed the sequential addition of various arylmagnesium bromide reagents in a controlled manner enabling assembling of diarylmethine unit. The developed synthetic route
为了组装生物学上重要的分子中存在的二芳基次甲基单元,我们开发了一种新的基于 Weinreb 酰胺 (WA) 的结构单元,该结构单元源自乙醇酸。该构件中存在的 WA 官能团允许以受控方式顺序添加各种芳基溴化镁试剂,从而能够组装二芳基次甲基单元。开发的合成路线可以轻松获得重要的二芳基乙烯和 α,α-二芳基乙二醇。合成的α,α-二芳基乙二醇为合成重要的对称和不对称α,α-二芳基乙醛作为有价值的中间体铺平了道路。
Aromatic enol ethers
申请人:Eastman Chemical Company
公开号:US10858304B1
公开(公告)日:2020-12-08
Disclosed are novel aromatic enol ethers. The aromatic enol ethers exhibit low volatile organic content and are reactive film-hardening compounds. The aromatic enol ethers are useful in a variety of chemical applications. The aromatic enol ethers can be used in applications as plasticizers, diluents, wetting agents, coalescing aids and as intermediates in chemical processes. The aromatic enol ethers also have utility as film-hardening additives for coating formulations.
Reactions with asymmetric diarylethanes and diarylethylenes. Part XIII. Rearrangements of 1,1-dihalogeno-2,2-diarylethanes and the corresponding 1-halogenoethylenes in boiling ethylene glycol, alone or in the presence of sodium 2-hydroxyethoxide
1,1-Dihalogeno-2,2-di-p-tolylethane in boiling ethylene glycol (98%) gave the corresponding 1-halogenoethylene, the corresponding stilbene, the cyclic acetal 1,1-ethylenedioxy-2,2-di-p-tolylethane, 4,4′-dimethyldeoxybenzoin, di-p-tolylacetaldehyde, and 4,4′-dimethylbenzophenone. The last three compounds are also formed when a solution of the acetal in acidified ethylene glycol (98%) is boiled. The
Silica-supported orthophosphoric acid (OPA/SiO2): preparation, characterization, and evaluation as green reusable catalyst for pinacolic rearrangement
作者:Muriel Billamboz、Estelle Banaszak
DOI:10.1007/s13738-018-01582-2
日期:2019.5
extracting solvent should be chosen with cautious to guarantee the recyclability of the catalyst. As example, pinacol rearrangement reactions were successfully realized with this catalyst and OPA/SiO2 proved to be as efficient as homogeneous orthophosphoric acid to promote the reaction of pinacol derivatives. When using dichloromethane as extracting solvent, OPA/SiO2 can be reuse up to ten times without
在本文中,我们报告了一种易于制备,具有成本效益,高效且可重复使用的二氧化硅负载的正磷酸(OPA)催化剂,用于品酒酸重排。借助31 P NMR,TGA,DSC,FT-IR,滴定和显微镜技术成功地表征了该催化剂的表面性质。氢键在表面上的OPA实际上是活性物质,反应似乎发生在嵌入二氧化硅载体中的液相中。因此,应谨慎选择萃取溶剂,以确保催化剂的可回收性。例如,使用该催化剂和OPA / SiO 2成功实现了频哪醇重排反应被证明与均相正磷酸一样有效,可以促进频哪醇衍生物的反应。当使用二氯甲烷作为萃取溶剂时,OPA / SiO 2可以重复使用多达十次,而不会显着降低活性。十次运行后,通过显微镜未观察到催化剂的物理损坏,证明了其适用于这种应用。
Strain‐Driven Dyotropic Rearrangement: A Unified Ring‐Expansion Approach to α‐Methylene‐γ‐butyrolactones
dyotropic rearrangement of α‐methylene‐β‐lactones has been realized, which enables the efficient access of a wide range of α‐methylene‐γ‐butyrolactones displaying remarkable structural diversity. Several appealing features of the reaction, including excellent efficiency, high stereospecificity, predictable chemoselectivity and broad substrate scope, render it a powerful tool for the synthesis of MBL‐containing