InBr<sub>3</sub>: A Versatile Catalyst for the Different Types of Friedel−Crafts Reactions
作者:Ponnaboina Thirupathi、Sung Soo Kim
DOI:10.1021/jo9014613
日期:2009.10.16
Mild and efficient InBr3-catalyzed Friedel−Crafts alkylation of heteroaromatic or electron-rich aromatic compounds with α-amido sulfones at room temperature in CH2Cl2 has been developed. The products undergo further Friedel−Crafts alkylation with heteroaromatic or electron-rich aromatic compounds leading to unsymmetrical or bis-symmetrical triaryl methanes in good yield. α-Amido sulfones are employed
Regioselective Arylations of α-Amido Sulfones with Electron-Rich Arenes through Friedel-Crafts Alkylations Catalyzed by Ferric Chloride Hexahydrate: Synthesis of Unsymmetrical and Bis-Symmetrical Triarylmethanes
作者:Ponnaboina Thirupathi、Sung Soo Kim
DOI:10.1002/ejoc.200901186
日期:2010.3
Ferricchloridehexahydrate is a highly efficient catalyst for the regioselectivearylation of α-amidosulfones. The products undergo further Friedel-Craftsalkylations with heteroaromatic or electron-richarenes to afford unsymmetrical or bis-symmetricaltriarylmethanes.
A rapid, highly efficient, and general protocol for the synthesis of functionalized triarylmethanes: a straightforward access for the synthesis of (−)-tatarinoid C
作者:B. Madhu Babu、Pramod B. Thakur、N. Nageswara Rao、G. Santosh Kumar、H.M. Meshram
DOI:10.1016/j.tetlet.2014.01.107
日期:2014.3
functionalized triarylmethane is described by the Friedel–Crafts alkylation of methoxybenzenes with a variety of aldehydes in the presence of BF3·OEt2. The generality of the method is demonstrated by screening a variety of di- or tri-substituted arenes as well as substituted aromatic, heteroaromatic, and aliphatic aldehydes. (−)-Tatarinoid C is synthesized in a single step following the same protocol.
Iodine is shown to be an efficient catalyst for the Friedel–Craftsalkylation of arenes with a wide variety of aldehydes in toluene under ‘open-flask’ and mild conditions. In the presence of 10 mol % of iodine, the reaction of arenes with aromaticaldehydes gives the corresponding triarylmethane derivatives (TRAMs), regioselectively, in good to excellent yields. On the other hand, a series of diarylalkane