The first highly efficient double Friedel–Crafts reaction of N-tosyl imines with anisole, phenol, thioanisole and analogues has been developed to produce the corresponding symmetric diarylmethanes and triarylmethanes with high regioselectivity in the presence of a catalytic amount of Bi2(SO4)3–TMSCl at room temperature.
Access to Enantiopure Triarylmethanes and 1,1-Diarylalkanes by NHC-Catalyzed Acylative Desymmetrization
作者:Shenci Lu、Xiaoxiao Song、Si Bei Poh、Hui Yang、Ming Wah Wong、Yu Zhao
DOI:10.1002/chem.201605445
日期:2017.2.16
We present herein an unprecedented, efficient and enantioselective synthesis of triarylmethanes and 1,1‐diarylalkanes through N‐heterocyclic carbene‐catalyzed acylative desymmetrization of bisphenols. This method utilizes readilyavailable substrates, reagents and a simple procedure to deliver the valuable products in excellent enantiopurity. DFT calculations reveal that the selectivity is governed
Room-Temperature Bismuth-Catalyzed Bis-arylation of Carbonyl Compounds with Aryl Ethers and Phenols
作者:Congrong Liu、Manbo Li
DOI:10.1002/cjoc.201300522
日期:2013.10
Using Bi2(SO4)3 as the catalyst and TMSCl as the additive, a wide variety of aldehydes, ketones, and acetals were smoothly condensed with arylethers at room temperature to provide the corresponding diarylmethanes and triarylmethanes selectively in good to excellent yields.
A simple protocol for the synthesis of triarylmethane derivatives with three different (hetero)aryl groups by decarbonylation of 3,3-diaryl benzofuranones, which can easily be prepared via arylation of benzofuranones, was developed. The reaction proceeds on heating in dimethylformamide (DMF) in the presence of CH3ONa and water to generate the products in good to excellent yields. This reaction can
Solventless triarylmethane synthesis via hydroxyalkylation of anisole with benzaldehyde by modified heteropoly acid on mesocellular foam silica (MCF)
作者:Kalpesh H. Bhadra、Ganapati D. Yadav
DOI:10.1016/j.mcat.2018.06.003
日期:2018.8
on mesocellularfoam (MCF) silica was prepared, characterized and tested for its activity in hydroxyalkylation reaction of anisole with benzaldehyde. Its activity was compared with commercial catalysts like Amberlyst-15, montmorillonite clay K-10, H3PW12O40 and unsupported Cs2.5H0.5PW12O40.The prepared catalyst showed the best activity compared to others with advantage of separation of catalyst and
三芳基甲烷(TRAM)化合物具有广泛的应用,例如用于感测肿瘤和其他生物活性的无色染料。芳烃与苯甲醛的羟烷基化导致形成三芳基甲烷化合物。在本研究中,制备了负载在介孔泡沫(MCF)二氧化硅上的20(wt。%)Cs 2.5 H 0.5 PW 12 O 40(Cs-DTP),表征并测试了其在苯甲醚与苯甲醚的羟烷基化反应中的活性。将其活性与市售催化剂(如Amberlyst-15,蒙脱土K-10,H 3 PW 12 O 40和无载体Cs 2.5 H 0.5 PW 12 O)进行了比较。40.与其他催化剂相比,制得的催化剂具有最佳的活性,具有分离催化剂和可重复使用的优点。详细研究了反应参数,并对该反应进行了动力学研究。发现20(wt。%)的Cs-DTP / MCF是最好的,坚固的和可重复使用的催化剂。还研究了反应机理和动力学。结果是新的。