Asymmetric Benzoylation of meso-Hydrobenzoin Using a Reusable Tripodal Imidazoline-Pyridine-Cu Catalyst
作者:Takayoshi Arai、Ken Sakagami
DOI:10.1002/ejoc.201101722
日期:2012.2
for use in Cu catalysis. The tripodal imidazoline–pyridine L6-Cu(BF4)2 complex catalyzed the asymmetric p-(tert-butyl)benzoylation of meso-hydrobenzoin to give the adduct in up to 85 % ee. After completion of the asymmetric benzoylation reaction, the self-supported tripodal imidazoline–pyridine–Cu catalyst could be easily recovered as a precipitate by adding hexane, and the recovered catalyst could
设计并合成了手性、自支撑、多位咪唑啉-吡啶配体,用于铜催化。三足咪唑啉-吡啶 L6-Cu(BF4)2 配合物催化了内消旋苯偶姻的不对称对(叔丁基)苯甲酰化反应,得到了高达 85% ee 的加合物。不对称苯甲酰化反应完成后,通过加入己烷可以很容易地以沉淀形式回收自支撑的三足咪唑啉-吡啶-Cu催化剂,并且回收的催化剂可以重复使用多次,同时保持催化剂的活性和选择性。