Zirconium-Mediated Selective Synthesis of 1,2,4,5-Tetrasubstituted Benzenes from Two Silyl-Substituted Alkynes and One Internal Alkyne
作者:Shi Li、Hongmei Qu、Lishan Zhou、Ken-ichiro Kanno、Qiaoxia Guo、Baojian Shen、Tamotsu Takahashi
DOI:10.1021/ol901153p
日期:2009.8.6
Selective synthesis of 1,2,4,5-tetrasubstituted benzenes was achieved via formation of 2,5-bis(trimethylsilyl)zirconacyclopentadienes from 2 equiv of TMS-substituted alkynes with Cp2ZrBu2 and Cu-mediated formation of 1,4-disilylbenzene by cycloaddition of zirconacyclopentadienes to disubstituted alkynes. Preparation of 1,2,3,4,9,10-hexasubstituted pentacene and 2,3,6,11-tetrasubstituted naphthacene
1,2,4,5-四取代的苯的选择性合成是通过由2当量的TMS取代的炔烃与Cp 2 ZrBu 2形成2,5-双(三甲基甲硅烷基)氧化锆环戊二烯和Cu介导的1,4-形成的通过将氧化锆环戊二烯环加成成二取代的炔烃来形成二甲硅烷基苯。通过使用四取代苯的同系或偶联方法证明了1,2,3,4,9,10-六取代并五苯和2,3,6,11-四取代并四苯衍生物的制备。