Diastereoselective Noncovalent Synthesis of Hydrogen-Bonded Double-Rosette Assemblies
作者:Leonard J. Prins、Ron Hulst、Peter Timmerman、David N. Reinhoudt
DOI:10.1002/1521-3765(20020517)8:10<2288::aid-chem2288>3.0.co;2-3
日期:2002.5.17
or M) in the corresponding hydrogen-bonded assemblies 1(3).(CA)(6) (de>98 %). The high degree of chiral induction results from the presence of six chiral centers in close proximity (C(alpha)) to the core of the assembly. A much lower level of chiral induction is observed for assemblies with chiral centers that are more remote (C(beta)). All diastereomerically pure assemblies 1(3).(CA)(6) exhibit very
杯[4]芳烃1的二蜜胺组分中或氰尿酸酯组分CA中存在的手性中心在相应的氢键键合组件1(3)。(CA)(6)(de)中定量诱导一种惯性(P或M)。 > 98%)。高度的手性诱导是由于六个手性中心(Cα)与装配体的核心非常接近。对于具有更远的手性中心(Cβ)的装配体,观察到了更低的手性诱导水平。所有非对映体纯组装1(3)。(CA)(6)都显示出非常高的CD活性(deltavarepsilon(max)约100 L mol(-1)cm(-1)),与低CD活性(deltavarepsilon (最大)