作者:Raphaël Lebeuf、Frédéric Robert、Yannick Landais
DOI:10.1021/ol051377i
日期:2005.10.1
regioselectivity of the Birch reductive alkylation of polysubstituted biaryls has been investigated. Results indicate that regioselectivity is affected by the electronic nature of substituents on both aromatic rings. The electron-rich 3,5-dimethoxyphenyl moiety is selectively reduced and then alkylated, while phenols and aniline are not dearomatized under these conditions. Biaryls possessing a phenol moiety are
[反应:见正文]已研究了多取代联芳基的桦木还原烷基化的区域选择性。结果表明,区域选择性受两个芳环上取代基的电子性质的影响。富电子的3,5-二甲氧基苯基部分被选择性还原,然后被烷基化,而苯酚和苯胺在这些条件下未脱芳基化。拥有酚部分的联芳基在第二个环上被烷基化,条件是在还原Li / NH3之前已除去了酸性质子。