Electrophilic substitution reactions of trisheteroarylmethanes: an efficient strategy to develop novel synthons for organic synthesis
摘要:
Trisheteroarylmethanes are interesting molecules for the construction of three dimensionally complex systems. From this vantage point, we studied electrophilic substitution reactions on tris-2-thienylmethane and tris-2-furylmethane. During the bromination reaction, we have isolated the tris-bromosubstituted tris-2-thienylmethane in the former case and brominated furanones in the latter case, which may be of synthetic and biological importance. (c) 2005 Elsevier Ltd. All rights reserved.
is the key reaction for the introduction of the fourth 2‐thienyl group, has been developed, thus, reaction of tris(2‐thienyl)methyl anion with 2‐fluoro‐5‐cyanothiophene smoothly proceeded to give (5‐cyano‐2‐thienyl)‐tris(2‐thienyl)methane in good yield. Alkaline hydrolysis of the cyano group to carboxylicacid followed by decarboxylation at 180°C in quinoline in the presence of copper(I) oxide afforded
A bicyclo-type cage-shaped compound consisting of three sexithiophenes was successfully synthesized and characterized by NMR, HRMS, and X-ray crystallographic analysis. The strained cage architecture was reflected in the blue-shifted absorption spectrum relative to its linear analogue. Intramolecular interaction between three-dimensionally fixed sexithiophenes was suggested by electrochemical analysis
The reaction of N-tosyl imines with heteroaromatic compounds: a new access to triheteroarylmethanes
作者:Baris Temelli、Dilek Isik Tasgin、Canan Unaleroglu
DOI:10.1016/j.tet.2010.06.070
日期:2010.8
Useful triheteroarylmethanes were prepared by the double Friedel–Crafts reaction of a wide variety of aromatic N-tosyl imines with furan, thiophene, and pyrrole in the presence of Cu(OTf)2 and Montmorillonite K-10 clay catalysts.
Efficient synthesis of triarylmethanes via bisarylation of aryl aldehydes with arenes catalyzed by silica gel-supported sodium hydrogen sulfate
作者:Yixin Leng、Fang Chen、Li Zuo、Wenhu Duan
DOI:10.1016/j.tetlet.2010.02.157
日期:2010.4
An efficient synthesis of triarylmethanes has been developed via bisarylation of aryl aldehydes with arenes catalyzed by silicagel-supportedsodiumhydrogensulfate in a solvent-free system. The new method features high yield, mild reaction conditions, and environmental friendliness.
Melamine Trisulfonic Acid: A New Efficient Catalyst for the Synthesis of Aryldithienylmethanes
作者:Liqiang Wu、Yunhui Yan、Fulin Yan
DOI:10.1080/10426507.2011.559496
日期:2012.2.1
Abstract An efficient method has been developed for the synthesis of dithienylmethanes via bisarylation of aldehydes with thiophene in the presence of melamine trisulfonic acid as a catalyst under solvent-free conditions. GRAPHICAL ABSTRACT