The syntheses of carbonylated benzo[2,1-b:3,4-b':5,6-c'']trithiophenes 2 and naphtho[2,1-b:3,4-b']dithiophenes 3 are described. The treatment of 5,5'-dicarbonylated 3,3'-bis(phenylethynyl)-2,2'-bithiophenes 6 [readily available via Pd(II)-catalyzed alkynylation of the corresponding 3,3'-dibromo-2,2'-bithiophenes 5 in the presence of Cu(I) in (i-Pr)2NH] with chlorotris(triphenylphosphine)rhodium(I) yields the cyclic rhodium complexes 7 which smoothly react with sulfur and acetylenes to give 2 and 3 in good yields.
描述了碳基化的苯并[2,1-b:3,4-b':5,6-c'']三
噻吩 2 和
萘[2,1-b:3,4-b']二
噻吩 3 的合成。将5,5'-二羰基化的3,3'-双(
苯乙炔)-2,2'-二
噻吩 6 [通过 Pd(II) 催化相应的3,3'-二
溴-2,2'-二
噻吩 5 与 Cu(I) 在(i-Pr)2NH中进行的
炔烃化反应易于获得] 与
氯三(三苯基
磷)
铑(I) 反应,生成环状
铑配合物 7,随后与
硫和
炔烃顺利反应,产出2和3,并具有良好的产率。