Copper-Catalyzed Trifluoromethylation/Cyclization of Alkynes for Synthesis of Dioxodibenzothiazepines
作者:Zi-Qi Zhang、Yi-Hao Xu、Jing-Cheng Dai、Yan Li、Jie Sheng、Xi-Sheng Wang
DOI:10.1021/acs.orglett.1c00344
日期:2021.3.19
A facile and efficient approach for the synthesis of the CF3-containing dioxodibenzothiazepines has been developed via copper-catalyzed trifluoromethylation/cyclization of alkynes utilizing a radical relay strategy. This method has demonstrated low catalyst loading, high regiocontrol, and broad scope under mild conditions. Good compatibility for the N-protecting group, gram-scale experiment, and further
A direct approach to 2-(aminomethyl)indoles by copper-catalyzed domino three-component coupling−cyclization of 2-ethynylanilines with a secondary amine and aldehyde has been developed. By use of a cyclic or acyclic secondary amine and aldehyde (paraformaldehyde, aliphatic or aromatic aldehydes) in the presence of 1 mol % of CuBr, 2-ethynylanilines were converted to a variety of substituted 2-(aminomethyl)indoles
通过铜催化的2-乙炔基苯胺与仲胺和醛的多米诺三组分偶联-环化反应,已开发出直接方法用于2-(氨基甲基)吲哚。通过在1摩尔%的CuBr存在下使用环状或无环仲胺和醛(低聚甲醛,脂肪族或芳香族醛),将2-乙炔基苯胺以良好的收率转化为各种取代的2-(氨基甲基)吲哚。利用该多米诺反应和吲哚C-3位的CH官能化,可以轻松合成多环吲哚。还介绍了通过磺酰胺和丙二酸酯同类物的反应来构建苯并[ e ] [1,2]噻嗪和茚基图案。
Synthesis of 2-(Trifluoromethyl)indoles via Domino Trifluoromethylation/Cyclization of 2-Alkynylanilines
作者:Yibin Ye、Kelvin Pak Shing Cheung、Lisi He、Gavin Chit Tsui
DOI:10.1021/acs.orglett.8b00509
日期:2018.3.16
A new method for the synthesis of 2-(trifluoromethyl)indoles using easily accessible 2-alkynylanilines and a well-established fluoroform-derived CuCF3 reagent is described. This method utilizes a domino trifluoromethylation/cyclization strategy to construct the indole cores with no ambiguity of the CF3 position. The intriguing 3-formyl-2-(trifluoromethyl)indoles can also be synthesized by this protocol
An oxidative copper-mediated double trifluoromethylselenolation of terminal 2-alkynylanilines using [(bpy)CuSeCF3]2 is reported, providing a moderately efficient and convenient approach to 2,3-bis(trifluoromethylseleno)indoles. Mechanistic studies show that a cascade sequence of oxidation, trifluoromethylselenolation, 5-endo-dig cyclization, and elimination is involved in this transformation.
Well-Defined Noble Metal Single Sites in Zeolites as an Alternative to Catalysis by Insoluble Metal Salts
作者:Paula Rubio-Marqués、Miguel A. Rivero-Crespo、Antonio Leyva-Pérez、Avelino Corma
DOI:10.1021/jacs.5b07304
日期:2015.9.16
that the resting insoluble metal is catalytically useless. To circumvent this waste of precious metal and follow a rational design, we generate here well-dispersed Pt(II) and Pd(II) single sites on zeolite Y, with an exquisite control of the Lewis acidity, to catalyze different hydroaddition reactions to alkynes and alkenes with up to 10(4) catalytic cycles (at least 2 orders of magnitude superior to
聚合形式的不溶性贵金属氯化物(即 PtCl2、PdCl2、AuCl、RhCl3)通常用作溶液中大量有机反应的催化剂。在这里,我们表明只有这些贵金属氯化物的少量可溶部分(通常为 5-30%)对炔烃和烯烃的加氢胺化、加氢烷氧基化、氢化硅烷化和环异构化具有催化活性,而其余的不溶性金属在催化上是无用的。为了避免这种贵金属的浪费并遵循合理的设计,我们在沸石 Y 上生成了分散良好的 Pt(II) 和 Pd(II) 单点,并巧妙地控制了路易斯酸度,