Copper and nickel complexes of 1,8-disubstituted derivatives of 1,4,8,11-tetraazacyclotetradecane
摘要:
The stereoselective synthesis of various 1,8-disubstituted derivatives of 1,4,8,11-tetraazacyclotetradecane (cyclam) has been achieved and copper and nickel complexes prepared. For the 1,8-dibutyl derivative, the square-planar nickel(II) complex exists as two diastereoisomers, as revealed by crystallographic analysis. The structure of the copper(II) complex of this ligand confirmed that a strong in-plane ligand field was conserved in square-planar complexes notwithstanding the dialkylation at nitrogen. The structures of the copper(II) complexes of two 1,8-dicarboxymethyl derivatives of cyclam also reveal primary N4 co-ordination with carboxyl oxygens occupying the elongated axial sites. The tricyclic ligand 1,5,8,12-tetraazatricyclo[10.2.2.2(5,8)]octadecane is readily prepared from one of these diacids and the copper complex is kinetically stable in solution with respect to attack by hydrogen sulfide and to acid-catalysed dissociation.
General routes for the synthesis of mono, di and tri-N-substituted derivatives of cyclam
作者:I.M. Helps、D. Parker、J.R. Morphy、J. Chapman
DOI:10.1016/0040-4020(89)80049-3
日期:1989.1
The selective synthesis of N-substituted derivatives of 1,4,8,11-tetraazacyclotetradecane may be achieved through N-tosyl or N-benzyl intermediates, permitting for example the synthesis of 1,8 disubstituted derivatives.
First synthesis of single-“strapped cyclam-porphyrins”
作者:Bernard Boitrel、Roger Guilard
DOI:10.1016/s0040-4039(00)73080-2
日期:1994.5
The first synthesis of strapped cyclam porphyrins is described ; these will be studied as dioxygen carriers as well as cytochrome C oxidase models. The original derivatives are characterized by mass spectrometry and 1H NMR spectroscopy. The cofacial conformation of the two different macrocycles is confirmed by 1H NMR data.
描述了环环卟啉的首次合成; 这些将作为双氧载体以及细胞色素C氧化酶模型进行研究。原始衍生物通过质谱和1 H NMR光谱进行表征。两个不同的大环的表面构象由1 H NMR数据证实。
Selective N,N-functionalisation of cyclam: crystal structure of the Cu2+ complex of 1,4,8,11-tetra-azacyclotetradecane-1,8-diacetic acid and the tricyclic lactam 15,18-dioxo-1,5,8,12-tetra-azatricyclo[10.2.2.25.8]tetradecane
作者:Ian M. Helps、David Parker、James Chapman、George Ferguson
DOI:10.1039/c39880001094
日期:——
A general synthetic method for the synthesis of 1,8-disubstituted derivatives of the 14-membered tetra-azamacrocycle, ‘cyclam’, involves selective ditosylation: in the Cu2+ complex of the 1,8-diacetic acid derivative, the copper is six-co-ordinate with elongated Cu–O interactions and this macrocycle undergoes lactamisation to form a paracyclophane-like tricyclic lactam which is resistant to acidic