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.
Exploration of structural motifs influencing solid-state conformation and packing of unclosed cryptands sharing the same 19-membered macrocyclic core
amide protons, UCs adopted only three well-defined geometries in all 10 analyzed crystals. This structural resemblance between conformations of UCs, however, is not translated into similarities in terms of intermolecular interactions and crystal packing. This contradicting intra- and intermolecular solid-state behavior is likely connected with an ability of these macrocyclic compounds to engage in
Synthesis and chiroptical properties of two new planar-chiral macrocycles
作者:Piotr Piątek、Jarosław Kalisiak、Janusz Jurczak
DOI:10.1016/j.tetlet.2004.02.063
日期:2004.4
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.