Preparation of 1,4-bis(2-ethynyl-3-thienyl)benzenes as versatile spacers for connection of heterocycles
摘要:
Iodination of 1,4-di(3-thienyl)benzene gave 1,4-bis(2-iodo-3-thienyl)benzene, which was converted to 1,4-bis(2-ethynyl-3-thienyl)benzene. Novel 1,4-bis[2-(pyridylethynyl)-3-thienyl]benzene ligands containing the bis(ethynylthienyl)benzene spacer were prepared by Sonogashira reaction. Advantage of the spacer was demonstrated by introducing functionalized alkyl groups to the 5-position of the thiciphene ring of 1,4-bisl2-(trialkylsilylethynyl)-3-thienyl]benzene.