S-(2-甲基苯基)N,N,N',N'-四甲基磷酸二酰胺基硫代硫酸盐与仲丁基锂在-105°锂化得到相应的苄基阴离子,该苄基阴离子被各种芳族酯酰化,以中等至高收率得到各种脱氧安息香衍生物。在回流甲酸中对这些产物进行酸性处理,得到了2-芳基苯并[ b ]噻吩衍生物。2-甲基苯并[ b ]噻吩和苯并[ b ]噻吩-2-(3- ħ也使用类似的方法制备) -酮。
Base-Mediated Intermolecular sp<sup>2</sup> C−H Bond Arylation via Benzyne Intermediates
作者:Thanh Truong、Olafs Daugulis
DOI:10.1021/ja200184b
日期:2011.3.30
A transition-metal-free method for arylation of heterocycle and arene carbon-hydrogen bonds by aryl chlorides and fluorides has been developed. The reactions proceed via aryne intermediates and are highly regioselective with respect to the C-H bond coupling component.
Conditions for the palladium-catalyzed directarylation of a wide range of heterocycles with aryl bromides are reported. Those conditions employ a stoichiometric ratio of both coupling partners, as well as a substoichiometric quantity of pivalicacid, which results in significantly faster reactions. An evaluation of the influence of the nature of the aryl halide has also been carried out.
Carboxylic Acids as Traceless Directing Groups for the Rhodium(III)-Catalyzed Decarboxylative CH Arylation of Thiophenes
作者:Yuanfei Zhang、Huaiqing Zhao、Min Zhang、Weiping Su
DOI:10.1002/anie.201411701
日期:2015.3.16
A rhodium(III)‐catalyzed carboxylic acid directed decarboxylative CH/CH cross‐coupling of carboxylic acids with thiophenes has been developed. With a slight adjustment of the reaction conditions based on the nature of the substrates, aryl carboxylic acids with a variety of substituents could serve as suitable coupling partners, and a broad variety of functional groups were tolerated. This method
Direct coupling reaction of benzo[b]thiophene and electron-rich aryl bromides was achieved under Pd2(dba)3/SPhos catalysis in the presence of NaOt-Bu. The reaction system was applied for the installation of 2-(methylthio)phenyl group onto thiophene-fused polyaromatic molecules, demonstrating facile synthesis of precursors for thienoacene derivatives.