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Spectroscopic characterization and molecular structure of 3,14‐dimethyl‐2,6,13,17‐tetraazapentacyclo[16.4.0.1 2,17 .1 6,13 .0 7,12 ]tetracosane
Author(s) -
Moon Dohyun,
Hong Yong Pyo,
Choi Jong-Ha
Publication year - 2016
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229616013280
Subject(s) - cyclam , crystal structure , molecule , intramolecular force , crystallography , methylene , chemistry , hydrogen bond , proton nmr , yield (engineering) , stereochemistry , single crystal , materials science , metal , medicinal chemistry , organic chemistry , metallurgy
Constrained cyclam derivatives have been found to exhibit anti‐HIV effects. The strength of binding to the CXCR4 receptor correlates with anti‐HIV activity. The conformation of the macrocyclic compound is very important for co‐receptor recognition. Therefore, knowledge of the conformation and crystal packing of macrocycles has become important in developing new highly effective anti‐HIV drugs. Structural modifications of N‐functionalized polyaza macrocyclic compounds have been achieved using various methods. A new synthesis affording single crystals of the title tetraazapentacyclo[16.4.0.1 2,17 .1 6,13 .0 7,12 ]tetracosane macrocycle, C 22 H 40 N 4 , is reported. Formaldehyde reacts readily at room temperature with the tetraazatricyclo[16.4.0.0 2,17 ]docosane precursor to yield a macropolycycle containing two five‐membered rings. Characterization by elemental, spectroscopic and single‐crystal X‐ray diffraction analyses shows that the asymmetric unit contains half of a centrosymmetric molecule. The molecular structure shows a trans conformation for the two methylene bridges owing to molecular symmetry. The crystal structure is stabilized by intramolecular C—H…N hydrogen bonds. NMR and IR spectroscopic properties support the methylene‐bridged macrocyclic structure.