An efficient and convenient palladium-catalyzed carbonylative procedure for the synthesis of bis(indolyl)methanes has been established for the first time. With TFBen (benzene-1,3,5-triyl triformate) as the solid CO source, aryl iodides and indoles were transformed into the corresponding bis(indolyl)methane derivatives in moderate to excellent yields.
A rapid, efficient and versatile green synthesis of 3,3'-diindolylmethanes
作者:Thanigaimalai Pillaiyar、Muhammad Dawood、Hina Irum、Christa E. Müller
DOI:10.24820/ark.5550190.p010.259
日期:——
The natural product 3,3’-diindolylmethane (DIM) exhibits anti-cancer and immunostimulatory properties. We report an operationally simple, efficient and versatile synthesis of DIM derivatives by reaction of indoles with aldehydes in the presence of sulfuric acid in water. Short reaction times of only 5 min, simple work-up procedure, avoidance of hazardous organic solvents, and excellent yields are apparent
天然产物 3,3'-二吲哚基甲烷 (DIM) 具有抗癌和免疫刺激特性。我们报告了一种操作简单、高效且通用的 DIM 衍生物合成方法,该合成方法是在水中硫酸存在下吲哚与醛反应。仅 5 分钟的短反应时间、简单的后处理程序、避免使用有害有机溶剂和出色的收率是该方法的明显优势。合成协议容忍广泛的官能团,允许快速、直接地访问各种 DIM 衍生物,包括 20 种以前未在文献中描述的新化合物,它们具有作为抗癌药物的潜力。
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
Chiral Sulfonimide as a Brønsted Acid Organocatalyst for Asymmetric Friedel–Crafts Alkylation of Indoles with Imines
作者:Ling-Yan Chen、Hao He、Wing-Hong Chan、Albert W. M. Lee
DOI:10.1021/jo2011335
日期:2011.9.2
Binaphthyl-based chiral sulfonimide (CSI) is demonstrated for the first time to be an efficient, strong Brønsted acid in asymmetric organocatalysis. A series of CSIs were synthesized and screened in the asymmetric Friedel–Crafts alkylation of indoles with imines. Good to excellent yields and enantioselectivities have been achieved. It was proved that it was crucial to wash the CSI catalyst with HCl