Heterobimetallic Ir–Sn catalysis: aza-Friedel–Crafts reaction of N-sulfonyl aldimines
摘要:
The heterobimetallic complex [Ir(COD)(SnCl3)Cl(mu-Cl)](2) catalyzes the aza-Friedel Crafts reaction of 1,3,5-trimethoxybenzene, as well as substituted indoles with N-sulfonyl aldimines leading to the formation of diarylamines and triarylmethanes in good yields. The symmetrical triarylmethanes were also obtained from diarylamines and suitable nucleophiles via simultaneous cleavage of sp(3) C-N bond and elimination of 1,3,5-trimethoxybenzene. (C) 2013 Elsevier Ltd. All rights reserved.
A mild, simple and convenient procedure for the synthesis of bis(indolyl)methane derivatives was described using N-sulfonic acid poly(4-vinylpyridinium) chloride as an efficient, cheap, and reusable catalyst under mild conditions.
Two novel binuclear sulfonic-functionalized ionic liquids: Influence of anion and carbon-spacer on catalytic efficiency for one-pot synthesis of bis(indolyl)methanes
from pyrazinium, piperazinium, benzimidazolium, imidazolium mono- or di-cation containing chloride and hydrogen sulfate as counter anion under optimized conditions. It was proved that the new ionic liquids containing two sulfonic imidazole moieties with four-carbon spacer as well as hydrogen sulfate as acidic counter anion were superior to the previously reported ionic liquids.
合成了两种新的具有四碳间隔基的双核磺酸官能化离子液体,并通过FTIR,MS,1 H和13对其结构进行了表征1 H NMR; 然后确定特定任务的新型离子液体水溶液的一些物理性质和pH值。研究了它们在温和条件下的双溶剂催化活性,以合成双(吲哚基)甲烷。在优化的条件下,将这些离子液体的催化活性与衍生自吡嗪鎓,哌嗪鎓,苯并咪唑鎓,咪唑鎓单或二阳离子的氯化物和硫酸氢盐作为抗衡阴离子的某些离子液体进行了比较。事实证明,含有两个带有四个碳间隔基的磺酸咪唑部分以及硫酸氢盐作为酸性抗衡阴离子的新型离子液体优于以前报道的离子液体。
BiVO4-NPs: an efficient nano-catalyst for the synthesis of biscoumarins, bis(indolyl)methanes and 3,4-dihydropyrimidin-2(1H)-ones (thiones) derivatives
作者:Farhad Shirini、Monireh Pourghasemi Lati
DOI:10.1007/s13738-016-0959-y
日期:2017.1
4-dihydropyrimidin-2(1H)-ones (thiones) derivatives. The structures of the products were characterized by IR, 1HNMR and 13C NMR spectroscopy and comparison with the authentic samples. Easy work-up procedure, excellent yields, short reaction times and reusability of the catalyst are some advantages of this work. In addition, in this article and for the first time, the preparation of 3,4-dihydropyrimidin-2(1H)-ones
BiVO 4 -NPs可用作促进双香豆素,双(吲哚基)甲烷和3,4-二氢嘧啶-2(1 H)-ones(thiones)衍生物合成的有效且可重复使用的纳米催化剂。产物的结构通过IR,1 H NMR和13 C NMR光谱表征,并与真实样品进行比较。简便的后处理程序,优异的收率,较短的反应时间和催化剂的可重复使用性是这项工作的一些优势。另外,在本文中并且首次报道了从醛的被保护的衍生物包括肟,半咔唑酮和1,1-二乙酸酯制备3,4-二氢嘧啶-2(1 H)-酮和-硫酮的报道。
Palladium(II) in electrophilic activation of aldehydes and enones: efficient C-3 functionalization of indoles
作者:Swapna Sarita Mohapatra、Priyabrata Mukhi、Anuradha Mohanty、Satyanarayan Pal、Aditya Omprakash Sahoo、Debjit Das、Sujit Roy
DOI:10.1016/j.tetlet.2015.08.080
日期:2015.10
The regioselectiveC-3 alkylation of indoles with aldehydes and enones as electrophiles is catalyzed by a d8 late transition metal complex PdCl2(MeCN)2 at room temperature in the presence of air/moisture and in the absence of any additional acid/base, additive, or ligand. The active catalyst in this alkylation is an organometallic intermediate C1 which is formed from the reaction of indole with the
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