Palladium-catalyzed direct 5-arylation of formyl- or acetyl-halothiophene derivatives
作者:Kassem Beydoun、Henri Doucet
DOI:10.1016/j.jorganchem.2010.12.021
日期:2011.5
found to catalyze the direct arylation of some functionalized halothiophene derivatives allowing the synthesis in only one step of polyfunctionalized arylated thiophenes. In the presence of 2-acetyl-3-chlorothiophene, 2-acetyl-4-chlorothiophene, 2-acetyl-3-bromothiophene diethylacetal or 2-(4-bromothiophen-2-yl)-[1,3]dioxolane, and a variety of aryl bromides, the 5-arylation products were obtained
发现Pd(OAc)2催化某些官能化卤代噻吩衍生物的直接芳基化,仅一步合成多官能化芳基噻吩。在2-乙酰基-3-氯噻吩,2-乙酰基-4-氯噻吩,2-乙酰基-3-溴噻吩二乙基缩醛或2-(4-溴噻吩-2-基)-[1,3]二氧戊环存在下在使用多种芳基溴化物的情况下,仅使用0.5摩尔%的催化剂即可以中等至高收率获得5-芳基化产物。另一方面,使用2-甲酰基-3-氯噻吩,2-乙酰基-3-溴噻吩或2-甲酰基-3-溴噻吩的结果令人失望。