An Effective Bismuth-Catalyzed Benzylation of Arenes and Heteroarenes
作者:Magnus Rueping、Boris J. Nachtsheim、Winai Ieawsuwan
DOI:10.1002/adsc.200606068
日期:2006.6
A highly efficient Bi(OTf)3-catalyzed benzylation of arenes and heteroarenes has been developed. The mild reaction conditions, high yields, operational simplicity and practicability, broad scope, and remarkably low catalyst loading render this environment friendly process an attractiv approach to diarylmethane derivatives. The extension to an intramolecular variant of this procedure provides a valuable
Synthesis of diarylmethanes via a Friedel–Crafts benzylation using arenes and benzyl alcohols in the presence of triphenylphosphine ditriflate
作者:Mohammad Mehdi Khodaei、Ehsan Nazari
DOI:10.1016/j.tetlet.2012.07.051
日期:2012.9
Triphenylphosphine ditriflate (TPPD) was found to be an efficient promoter for the Friedel–Craftsbenzylation of arenes with benzyl alcohols in CH2Cl2 at room temperature. The good yields, the 1:1 molar ratio of arene and benzyl alcohol, the benzylation of chlorobenzene as a nonactivated aromatic compound at room temperature, and no by-product formation are the main advantages of this procedure.
Transition-metal-catalyzed alkylation reactions of arenes have become a central transformation in organic synthesis. Herein, we report the first general strategy for alkylation of arenes with styrenes and alcohols catalyzed by carbon-based materials, exploiting the unique property of graphenes to produce valuable diarylalkane products in high yields and excellent regioselectivity. The protocol is characterized
芳烃的过渡金属催化烷基化反应已成为有机合成的核心转化。在此,我们报告了第一个由碳基材料催化的芳烃与苯乙烯和醇类烷基化的一般策略,利用石墨烯的独特性质以高产率和优异的区域选择性生产有价值的二芳基烷烃产品。该协议的特点是广泛的底物范围和出色的官能团耐受性。值得注意的是,该过程构成了石墨烯的第一个普遍应用,以利用锚定在 GO 表面上的极性官能团促进直接 CC 键的形成,从而为使用良性且易于获得的石墨烯材料进行一系列官能团烷基化打开了大门。
Iron-Catalyzed Arylation of Aromatic Ketones and Aldehydes Mediated by Organosilanes
作者:Risto Savela、Marcin Majewski、Reko Leino
DOI:10.1002/ejoc.201402023
日期:2014.7
arylation of aromatic carbonyl compounds is reported. The use of 4 % FeCl3 or Fe(acac)3 as the catalyst, in combination with a slight excess of chlorotrimethylsilane and triethylsilane, chlorination of benzylic ketones and aldehydes with subsequent Friedel–Craftsalkylation of arenes is achieved. Although the method is limited by the general constraints associated with Friedel–Craftsalkylation reactions
Highly efficient iodine-catalyzed hydroarylation of arenes with styrenes
作者:Cheng-Ming Chu、Wan-Ju Huang、Ju-Tsung Liu、Ching-Fa Yao
DOI:10.1016/j.tetlet.2007.07.178
日期:2007.9
Iodine mediates the hydroarylation of styrenes with arenes and heteroarenes to afford 1,1-diarylalkanes in good to high yields. Details regarding the substrate scope and selectivity of this hydroarylation reaction are discussed.