Dihalo-Substituted Dibenzopentalenes: Their Practical Synthesis and Transformation to Dibenzopentalene Derivatives
作者:Feng Xu、Lifen Peng、Akihiro Orita、Junzo Otera
DOI:10.1021/ol3017353
日期:2012.8.3
with I2 and IBr, respectively. These dihalo-substituted pentalenes reacted with terminal ethynes in Sonogashira coupling and with arylboronic acid in Suzuki–Miyaura coupling to give a series of phenylethynyl- and/or aryl-substituted pentalenes. Suzuki–Miyaura coupling of the halopentalenes with in situ prepared pentaleneboronic esters provided bis-, tri-, and tetra(dibenzopentalene)s. It was found that
通过分别用I 2和IBr处理5,6,11,12-四氢二苯并[ a,e ]环辛烯来获得二碘和溴碘取代的二苯并戊烯。这些二卤代戊烯与Sonogashira偶联中的末端乙炔和铃木-Miyaura偶联中的芳基硼酸反应,生成一系列苯乙炔基和/或芳基取代的戊烯。卤代戊烯与原位制备的戊烯硼酸酯的Suzuki-Miyaura偶联提供了双,三和四(二苯并戊烯)。发现这些二苯并戊烯低聚物经历了容易的电化学还原,并且由于它们扩展的π系统而在UV-vis吸收光谱中呈现出红移。