Trianglamines, macrocyclic heteraphanes, were readily synthesised through a [3+3] cyclocondensation of (R,R)-1,2-diaminocyclohexane with terephthalaldehyde, followed by NaBH4 reduction and N-alkylation. The macrocyclic ring shows a remarkable ability to change its conformation, as a consequence of rotation about the C-N bonds or nitrogen inversion due to protonation or N-alkylation, as revealed by
Microwave irradiation of various dialdellydes and chiral diamines afforded chiral macrocyclic imines in moderate to good yields. Linked dialdehydes predominantly form [2+2] macrocycles whereas dialdehydes without linkers yield [3+3] macrocycles. This is the first report of template-free synthesis of calixsalen-type macrocycles formed in shorter reaction times under micro vave conditions. In all the reactions, the salts of chiral diamines were used in contrast to the free diamines normally employed. (c) 2005 Elsevier Ltd. All rights reserved.
Designing Large Triangular Chiral Macrocycles: Efficient [3 + 3] Diamine−Dialdehyde Condensations Based on Conformational Bias
作者:J. Gawroński、H. Kołbon、M. Kwit、A. Katrusiak
DOI:10.1021/jo000623v
日期:2000.9.1
Triangular 30- and 27-membered hexaiminomacrocycles 4 and 5 of D-3 and C-3 symmetry, respectively, are readily obtained by unprecedented [3 + 3] cyclocondensation of (R,R)-1,2-diaminocyclohexane with, accordingly, terephthalaldehyde and isophthalaldehyde. The course of the reaction, leading to macrocyclization, is governed by conformational constraints imposed on the structural components of the intermediate products, as shown by molecular modeling. X-ray analysis of cocrystal 4 . AcOEt revealed that the macrocycle symmetry significantly departs from ideal D3 symmetry due to crystal environment. Cyclic hexaamines 6 and 7 were prepared by sodium borohydride reduction of 4 and 5, respectively.
(3+3)-Cyclocondensation of the enantiopure and racemic forms of trans-1,2-diaminocyclohexane with terephthaldehyde. Formation of diastereomeric molecular triangles and their stereoselective solid-state stacking into microporous chiral columns
作者:Martin Chadim、Miloš Buděšı́nský、Jana Hodačová、Jiřı́ Závada、Peter C. Junk
DOI:10.1016/s0957-4166(00)00494-8
日期:2001.2
The non-templated reaction of both the homochiral as well as the racemic form of trans-1,2-diaminocyclohexane with terephthaldehyde affords (3+3)-cyclocondensed molecular triangles in practically quantitative yields. The configuration of the diastereomeric products resulting in the individual reactions has been determined by H-1 and C-13 NMR spectroscopy. Unambiguous proof has been obtained by X-ray crystal structure analysis of both alternative diastereomers, revealing also a stereoselective stacking of the triangles into microporous chiral columns. (C) 2001 Elsevier Science Ltd. All rights reserved.
The application of quasi-enantiomeric trianglamine macrocycles as chiral probes for anion recognition in ion trap ESI mass spectrometry
作者:Nikolai Kuhnert、David Marsh、Daniel C. Nicolau
DOI:10.1016/j.tetasy.2007.07.011
日期:2007.7
This paper reports the synthesis and application of quasi-enantiomeric trianglamine macrocycles for chiral analysis using ion trap ESI mass spectrometry. The quasi-enantiomeric macrocycles were shown to display chiroselection towards a series of enantiomerically pure carboxylic acids and therefore act as chiral probes for anions in the gas phase and in solution. (c) 2007 Elsevier Ltd. All rights reserved.