One-Pot Construction of 3,3′-Bisindolylmethanes through Bartoli Indole Synthesis
摘要:
A one-pot approach to 3,3'-bisindolylmethane derivatives from nitrobenzene derivatives through the Bartoli indole synthesis was developed, in which the acid used to quench the reaction markedly affected its outcome. Quenching the reaction with concd HCl produced 3,3'-bisindolylmethane in contrast to the formation of 7-substituted indole by quenching with NH4Cl.
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。
Halogen Bond-Catalyzed Friedel–Crafts Reactions of Aldehydes and Ketones Using a Bidentate Halogen Bond Donor Catalyst: Synthesis of Symmetrical Bis(indolyl)methanes
作者:Xuelei Liu、Shuang Ma、Patrick H. Toy
DOI:10.1021/acs.orglett.9b03578
日期:2019.11.15
The use of a halogen bond donor to catalyze Friedel-Crafts reactions of indoles with a range of aldehydes and ketones to directly produce bis(indolyl)methanes, including the natural products arsindoline A, arundine, trisindoline, and vibrindole A, is reported. The bidentate catalyst used in these reactions proved to be more effective than a monondentate analogue, a thiourea commonly used as an organocatalyst
Development of an imidazole salt catalytic system for the preparation of bis(indolyl)methanes and bis(naphthyl)methane
作者:Xu Wang、Courtney C. Aldrich
DOI:10.1371/journal.pone.0216008
日期:——
Imidazolium salts are shown to catalyze the rapid room temperature reaction of indoles or naphthol with aldehydes to provide bis(indolyl)methanes or bis(naphthol)methane in excellent yields and the reaction proceeds optimally in dichloromethane with no base additives. The reaction exhibits a broad substrate tolerance and occurs through nucleophilic activation of the indoles and naphthols through a
(Thio)urea-catalyzed Friedel-Crafts Reaction: Synthesis of Bis(indolyl)- methanes
作者:Juan A. Rivas-Loaiza、Carlos E. Reyes-Escobedo、Yliana Lopez、Susana Rojas-Lima、Juan Pablo García-Merinos、Heraclio López-Ruiz
DOI:10.2174/1570178616666190222150915
日期:2019.10.9
products vibrindole A (3n), arsindoline A (3i), arundine (3o) and tris(1H-indol-3-yl)methane (3j). Additionally, the synthesis of streptindole was carried out via intermediate 3g. This methodology is well suited for the synthesis of bis(indolyl)methanes: it offers good yields of products, low sensitivity to moisture and oxygen, high tolerance to different functional groups on the aldehydes such as alkynes
Herein, we demonstrated Mn-catalyzed selective C-3 functionalization of indoles with alcohols. The developed catalyst can also furnish bis(indolyl)methanes from the same set of substrates under slightly modified reaction conditions. Mechanistic studies reveal that the C-3 functionalization of indoles is going via a borrowing hydrogen pathway. To highlight the practical utility, a diverse range of substrates