Stepwise Synthesis of Conjugatively Bridged Bipyridine Ligands from Thiophene and Alkyne Linkages
作者:Raymond Ziessel、Sébastien Goeb、Antoinette De Nicola
DOI:10.1055/s-2005-861847
日期:——
coupling reaction of 5,5'-dibromo-2,2'-bipyridine with TMS and CMe 2 OH protected acetylene allows the synthesis of a disymmetrically functionalized building block which was selectively deprotected from the TMS or the 2-hydroxy-prop-2-yl site. Various combinations allow the interconnection of the terminal alkyne to 3,4-dibutyl-2-iodothiophene or 3,4-dibutyl-2,5-diiodothiophene leading to bipyridine frameworks
5,5'-二溴-2,2'-联吡啶与 TMS 和 CMe 2 OH 保护的乙炔的双重 Sonogashira 偶联反应允许合成从 TMS 或 2-羟基-丙二醇选择性脱保护的双对称官能化结构单元-2-基位点。各种组合允许末端炔烃与 3,4-二丁基-2-碘噻吩或 3,4-二丁基-2,5-二碘噻吩互连,从而形成带有两个乙炔基噻吩单元或一个噻吩/一个乙炔官能团的联吡啶骨架。可以构建双位或三位联吡啶配体,其中螯合亚基由 3,4-二丁基-2,5-二乙炔基噻吩间隔物桥接,并由 3,4-二丁基-2-乙炔基噻吩终止剂封端。