Synthesis and chiroptical properties of two new planar-chiral macrocycles
摘要:
Could simple intraannular-arm macrocyclic systems exist in enantiopure stable forms? The effective synthesis of two representative compounds of such a class, their resolution into enantiomers, and experiments justifying their stability toward racemization are presented. (C) 2004 Elsevier Ltd. All rights reserved.
A Versatile Approach to the Synthesis of Pendant Benzodiazacoronands
作者:Janusz Jurczak、Jarosław Kalisiak、Piotr Piątek
DOI:10.1055/s-2005-869968
日期:——
A versatileapproach to the synthesis of pendant benzodiazacoronands is presented. Macrocyclic compounds possessing intra-annular amine or hydroxy group were obtained and N-benzamide. O-benzyl or O-benzoyl side-arms were introduced into such a macrocyclic framework. Mild conditions and satisfactory yield of presented synthetic pathways offer a wide and easy access to new macrocyclic compounds having
A versatile system for preparing macrocyclic compounds with planar chirality is presented. In this system chiral diazacoronands are synthesized readily from lariat-type diesters 13 and 14 and unsymmetrical diamines 7, 8, 12, 15, and 16 under non-high-dilution conditions. The title compounds were subjected to structural analysis by X-ray crystallography and circular dichroism spectroscopy, and absolute
Structural studies and binding properties of pendant diazacoronands—precursors to macrocyclic compounds of planar chirality
作者:Jarosław Kalisiak、Ewa Kalisiak、Janusz Jurczak
DOI:10.1016/j.tet.2006.04.024
日期:2006.6
Structural studies of pendant diazacoronands having an N-benzoyl, N-acetyl, O-benzyl or O-benzoyl side arm were performed by means of X-ray and temperature-dependent H-1 NMR experiments. The energies of macroring flipping process were determined for three pendant diazacoronands. The complexation properties of pendant diazacoronands toward the alkali metal cations (Na+, K, and Rb+) were estimated by ESI-MS experiments. (c) 2006 Elsevier Ltd. All rights reserved.