Pd Nanoparticle-Catalyzed Stereospecific Mizoroki–Heck Arylation of <i>cis</i>-1,2-Disilylarylethylenes
作者:Georgios Kyriakakis、Marios Kidonakis、Anastasia Louka、Manolis Stratakis
DOI:10.1021/acs.joc.3c01500
日期:2024.2.2
lenes undergo with aryl iodides a stereospecific Mizoroki–Heck arylation leading to trans-ditrimethylsilyldiarylethylenes. This chemoselectivity is in contrast to that of their trimethylgermyl analogues, which are arylated at the position of the C–Ge bonds. trans-1,2-Ditrimethylsilylarylethylenes are completely unreactive under the standard reaction conditions. The reaction tolerates the presence of
在催化量的 Pd 纳米粒子(由 Pd 2 dba 3 /Ag(I) 生成)存在下,顺式-1,2-二三甲基甲硅烷基芳基乙烯与芳基碘化物发生立体定向 Mizoroki-Heck 芳基化,生成反式 -二三甲基甲硅烷基二芳基乙烯。这种化学选择性与它们的三甲基甲锗烷基类似物相反,后者在 C-Ge 键位置芳基化。反式-1,2-二三甲基甲硅烷基芳基乙烯在标准反应条件下完全不反应。该反应允许芳基碘化物上存在硼基、甲硅烷基或溴取代基。从机理角度来看,该过程涉及顺式芳基钯化,然后是顺式脱氢钯化。