Air-stable μ-oxo-bridged binuclear titanium(IV) salophen perfluorooctanesulfonate as a highly efficient and recyclable catalyst for the synthesis of bis(indolyl) methane derivatives
An air-stable μ-oxo-bridged binuclear Lewisacid of titanium(IV) salophen perfluorooctanesulfonate [Ti(salophen)H2O}2O][OSO2C8F17]2 (1) was successfully synthesized by the reaction of TiIV(salophen)Cl2 with AgOSO2C8F17 and characterized by different techniques such as IR, NMR and HRMS. TG-DSC analysis showed that this complex was thermally stable at 220 °C. Meanwhile, it exhibited good solubility
通过该反应成功合成了四氟钛氧萘酚全氟辛烷磺酸[Ti(salophen)H 2 O} 2 O] [OSO 2 C 8 F 17 ] 2(1)的空气稳定的μ-氧代桥联双核路易斯酸。用AgOSO 2 C 8 F 17制备Ti IV(盐基)Cl 2,并通过不同的技术(例如IR,NMR和HRMS)进行表征。TG-DSC分析表明该络合物在220℃下是热稳定的。同时,它在极性有机溶剂中表现出良好的溶解性,并在CH 3中表现出良好的离子离解性CN解决方案。荧光光谱和哈米特指示剂结果表明该配合物具有相对强的酸性。通过醛/酮与吲哚的Friedel-crafts反应,对合成双(吲哚基)甲烷衍生物具有很高的催化效率。而且,在催化效率变化最小的情况下,它可以重复使用五次。
Air-stable Organobismuth(V) Bisperfluorooctanesulfonate as an Efficient Catalyst for the Synthesis of N-Containing Compounds
Triphenyl bismuth bisperfluorooctanesulfonate is an air‐ and water‐stable Lewis acid. It exhibits high catalytic efficiency for the synthesis of nitrogen heterocycles such as diindolylmethane derivatives, dihydropyrimidinones, dihydropyridines and 1,2‐disubstitued benzimidazoles under mild condition. Furthermore, it can be reused without loss of activity in a test of five cycles.This catalytic system
FeCl<sub>3</sub>·6H<sub>2</sub>O as a Mild Catalyst for Nucleophilic Substitution of Symmetrical Bis(indoyl)methanes
作者:Chayamon Chantana、Jaray Jaratjaroonphong
DOI:10.1021/acs.joc.0c02466
日期:2021.2.5
In this paper, unsymmetrical bis(indolyl)methane (BIM) and 3-alkylindole derivatives are smoothly synthesized from symmetrical BIMs with a variety of nucleophiles including heteroaromatic/aromatic compounds, allylsilane and alkynylsilane. FeCl3·6H2O is found to be a mild and highly effective catalyst for this nucleophilic substitution reaction in which N-methyl-2-phenylindole behaves as a good leaving
nonsymmetrical bis(indolyl)methanes (BIMs) through transindolylation of readily available symmetrical 3,3′-BIMs with various indoles catalyzed by silica-supported sulfuricacid has been established. This approach not only provides a useful strategy for the synthesis of structurally diverse BIMs, but also provides examples of nucleophilic substitution of BIMs with aromatic and nonaromatic π-systems