Synthesis of Biaryl Compounds through Three-Component Assembly: Ambidentate Effect of the<i>tert</i>-Butyldimethylsilyl Group for Regioselective Diels-Alder and Hiyama Coupling Reactions
作者:Shuji Akai、Takashi Ikawa、Sho-ichi Takayanagi、Yuki Morikawa、Shinya Mohri、Masaya Tsubakiyama、Masahiro Egi、Yasufumi Wada、Yasuyuki Kita
DOI:10.1002/anie.200803011
日期:2008.9.22
A practical ortho-rearrangement of silyl group of ortho-bromophenyl silyl ethers using magnesium(0)
phenol from ortho-bromophenyl silylethers without using RLi is described. Various ortho-bromophenyl silylethers are treated with commercially available Mg turnings, which are easy to handle in air, and transfer of the silyl group to the ortho-position occurs in good to high yields. Selective mono-magnesiation of 2,6-dibromophenyl silylether is observed even in the presence of excess Mg, and ortho-bromo-6-silylphenol
描述了不使用RLi由邻-溴苯基甲硅烷基醚实际合成邻-甲硅烷基取代的苯酚的方法。各种邻-溴苯基甲硅烷基醚用市售的Mg车削剂处理,易在空气中处理,并且甲硅烷基转移至邻位的收率高至高。即使在存在过量的Mg的情况下,也观察到2,6-二溴苯基甲硅烷基醚的选择性单放大,并且获得了邻溴-6-甲硅烷基苯酚作为主要产物。将得到的邻甲硅烷基取代的苯酚用(CH 2 O)n / MgCl 2 / Et 3甲酰化。N,然后与二胺缩合以良好的收率得到甲硅烷基取代的Salen型配体。该方案适用于大规模合成带有亚胺基的甲硅烷基取代的salen型配体。