Novel doublehelices covalently bridged by cyclic boronate esters were synthesized from complementary dimers with an m‐terphenyl backbone joined by a chiral or achiral phenylene linker bearing diethyl boronates and diols, respectively. The X‐ray crystallographic analysis and variable‐temperature NMR and circular dichroism measurements, along with theoretical calculations, revealed that the double helices
Diastereoselective Imine-Bond Formation through Complementary Double-Helix Formation
作者:Hidekazu Yamada、Yoshio Furusho、Eiji Yashima
DOI:10.1021/ja301430h
日期:2012.5.2
different stereostructures are synthesized and used as templates for diastereoselective imine-bond formations between two achiral carboxylic acid monomers bearing a terminal aldehyde group and racemic 1,2-cyclohexanediamine, resulting in a preferred-handed double helix stabilized by complementary salt bridges. The diastereoselectivity of the racemic amine is significantly affected by the chirality of