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 asymmetricbenzoylation reaction, the self-supported tripodalimidazoline–pyridine–Cucatalyst 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。
Enantioselective Acylation of 1,2- and 1,3-Diols Catalyzed by Aminophosphinite Derivatives of (1<i>S</i>,2<i>R</i>)-1-Amino-2-indanol
A phosphinite derivative that can be easily prepared in two steps from commercially available aminoindanol was found to be an effective catalyst for enantioselective acylation of diols. For the asymmetric desymmetrization of meso-1,2-diols, the corresponding monoester was obtained in up to 95% ee from the reaction in the presence of 5 mol % catalyst.