Enantiomerically pure tetraphenylene-based homochiral macrocyclic tetramer and its recognition property towards C76 fullerene
摘要:
The synthesis and characterization of novel homochiral oligomacrocycle species composed of enantiomerically-pure tetraphenylene were described. Structural studies showed that the macrocyclic molecule possessed a helical chiral cavity, which exhibited unique and efficient recognition affinity towards fullerene C-76 in toluene, as demonstrated by UV-vis titration experiments. The binding results were also interpreted through semi-empirical calculations. (C) 2017 Elsevier Ltd. All rights reserved.
献给教授迪特尔·恩德斯博士在他的70之际个生日。 抽象的 具有刚性构象的羟基四亚苯基是在不对称合成中用作手性配体的潜在候选者。发现醛与重氮-N,N-二甲基乙酰胺之间的高度非对映选择性和对映选择性Darzens反应是由由Ti(O i Pr)4和手性1,16-二羟基四亚苯基原位形成的手性钛络合物催化的,从而导致形成中等至高收率的顺式-缩水甘油酰胺,具有出色的对映体纯度(40–99%收率,高达99%ee)。 具有刚性构象的羟基四亚苯基是在不对称合成中用作手性配体的潜在候选者。发现醛与重氮-N,N-二甲基乙酰胺之间的高度非对映选择性和对映选择性Darzens反应是由由Ti(O i Pr)4和手性1,16-二羟基四亚苯基原位形成的手性钛络合物催化的,从而导致形成中等至高收率的顺式-缩水甘油酰胺,具有出色的对映体纯度(40–99%收率,高达99%ee)。
Enantioselective Brønsted base catalyzed [4+2] cycloaddition using novel amino-substituted tetraphenylene derivatives
作者:Chun-Kit Hau、Hao He、Albert W.M. Lee、David T.W. Chik、Zongwei Cai、Henry N.C. Wong
DOI:10.1016/j.tet.2010.10.064
日期:2010.12
This paper is concerned with the syntheses of 1,8,9,16-tetrahydroxytetraphenylene derivatives and their applications as Brensted base organocatalysts for [4+2] cycloaddition between anthrone and maleimides. The structural modifications of the catalysts and their related catalytic properties are described and discussed in details. (C) 2010 Elsevier Ltd. All rights reserved.