Synthesis of Dibenzo[<i>g,p</i>]chrysenes from Bis(biaryl)acetylenes via Sequential ICl-Induced Cyclization and Mizoroki−Heck Coupling
作者:Chia-Wen Li、Cheng-I Wang、Hsin-Yi Liao、Rupsha Chaudhuri、Rai-Shung Liu
DOI:10.1021/jo701504m
日期:2007.11.1
We report a facile synthesis of functionalized dibenzo[g,p]chrysenes via initial ICl-promoted cyclization of bis(biaryl)acetylenes, followed by the Mizoroki−Heck coupling reaction. This new approach works well for various bis(biaryl)acetylenes to afford dibenzo[g,p]chrysenes bearing various functionalities. With substrates of one special type including 4‘-methoxy-2-ethynylbiphenyls, we found that the
我们报告了通过初始ICl促进的双(Biaryl)乙炔的初始ICl环化,然后进行Mizoroki-Heck偶联反应,轻松合成功能化的二苯并[ g,p ]。该新方法对于各种双(联芳基)乙炔很好地起作用,以提供具有各种官能度的二苯并[ g ] ,[ p ]。对于包括4'-甲氧基-2-乙炔基联苯在内的一种特殊类型的底物,我们发现ICl处理导致ipso环化生成双环螺环己二酮。在MeOH / H 2 SO 4的存在下,这些螺酮产品经过选择性的1,2-链烯基迁移而发生重排,从而生成9-碘菲。我们制备了各种4'-甲氧基-2-乙炔基联苯化合物,以显示这种ipso环化和1,2-烯基转移的一般性。此本位-cyclization方法可以扩展二苯并[的制备克,p ] chrysenes。