Chemoenzymatic Synthesis and Application of Bicyclo[2.2.2]octadiene Ligands: Increased Efficiency in Rhodium-Catalyzed Asymmetric Conjugate Additions by Electronic Tuning
作者:Yunfei Luo、Andrew J. Carnell
DOI:10.1002/anie.200907033
日期:2010.4.1
On your bi(cycle)ke! A series of 1,4‐dimethyl bicyclic [2.2.2] diene ligands with tunable substitution at the bridge positions was accessed using a lipase resolution and a high yielding six step sequence (see scheme). The bridgehead methyl groups improve efficiency allowing less aryl boronic acid to be used in the title reaction.
在你的自行车上!使用脂肪酶分辨率和高产率的六步序列(参见方案),获得了一系列在桥位置具有可调取代的1,4-二甲基双环[2.2.2]二烯配体。桥头甲基提高了效率,使得在标题反应中可使用较少的芳基硼酸。