We report here our results on the FeCl3âdiorganyl dichalcogenides intramolecular cyclization of 2-organochalcogen-3-alkynylthiophenes. The cyclization reaction proceeded cleanly under mild reaction conditions giving the (S)-Se-, (S)-S- and (S)-Te-heterocycles in good yields. In addition, the obtained chalcogenophenes were readily transformed into more complex products using the palladium cross-coupling reaction with boronic acids. Conversely, using a metalâhalogen exchange reaction with n-BuLi, the chalcogenophenes produced the lithium-intermediate which was trapped with aldehyde furnishing the desired secondary alcohol in good yield.
我们在此报告关于FeCl3–二有机二
硫醚对2-有机
硫-3-炔基
噻吩的分子内环化反应的结果。该环化反应在温和的反应条件下进行,反应过程顺利,产出了(S)-Se-、(S)-S-和(S)-Te-杂环,并且收率良好。此外,所得到的
硫族
噻吩可以通过与
硼酸的
钯交叉偶联反应方便地转化为更复杂的产品。相反,利用n-BuLi进行
金属-卤素交换反应,
硫族
噻吩生成了
锂中间体,该中间体与醛反应生成所需的二级醇,且收率良好。