Synthesis and characterization of 1,6,11-triazacyclopentadecane and its zinc(II) complex
摘要:
A new triazamacrocycle, 1,6,11-triazacyclopentadecane (tacpd), has been synthesized and its complexation behaviors toward nickel(II), copper(II) and zinc(II) ions have been examined. tacpd formed a Zn(II) complex of the composition Zn3(tacpd)2Cl6 but no discrete complexes with Ni(II) and Cu(II) ions. The H-1 and C-13 NMR spectra indicated that the zinc complex is stable in N,N-dimethylformamide and formulated as [Zn(tacpd)Cl]2[ZnCl4] in which [Zn(tacpd)Cl]+ assumes a tetrahedral structure formed by the chloride ion and three nitrogens of tacpd.
A practical method for building linear and cyclic triamines from (2-trimethylsilyl)ethanesulfonamides (SES-amides)
摘要:
SES-chloride has been obtained in higher yield and purity by improving Weinreb's original procedure, allowing efficient access to the primary SES-amide. Linear triamines can be built conveniently from the SES-amide in high yields, with the potential for orthogonal protection. The modified Richman-Atkins cyclisation of SES-amides allows access to novel biologically interesting triazamacrocycles with combinations of three-, four-, five- and six-carbon bridges within the ring. Purification of the free macrocyclic amines by distillation greatly simplifies the workup, increasing the practicability of multi-gram scale synthesis. Although CsF sometimes provided undesirably low yields in the deprotection step, alternative fluoride sources were found to be unsuitable for the deprotection of SES-triazamacrocycles. (C) 2003 Elsevier Ltd. All rights reserved.
A practical method for building linear and cyclic triamines from (2-trimethylsilyl)ethanesulfonamides (SES-amides)
作者:Laurie L Parker、Nicholas D Gowans、Stephen W Jones、David J Robins
DOI:10.1016/j.tet.2003.10.067
日期:2003.12
SES-chloride has been obtained in higher yield and purity by improving Weinreb's original procedure, allowing efficient access to the primary SES-amide. Linear triamines can be built conveniently from the SES-amide in high yields, with the potential for orthogonal protection. The modified Richman-Atkins cyclisation of SES-amides allows access to novel biologically interesting triazamacrocycles with combinations of three-, four-, five- and six-carbon bridges within the ring. Purification of the free macrocyclic amines by distillation greatly simplifies the workup, increasing the practicability of multi-gram scale synthesis. Although CsF sometimes provided undesirably low yields in the deprotection step, alternative fluoride sources were found to be unsuitable for the deprotection of SES-triazamacrocycles. (C) 2003 Elsevier Ltd. All rights reserved.
Synthesis and characterization of 1,6,11-triazacyclopentadecane and its zinc(II) complex
A new triazamacrocycle, 1,6,11-triazacyclopentadecane (tacpd), has been synthesized and its complexation behaviors toward nickel(II), copper(II) and zinc(II) ions have been examined. tacpd formed a Zn(II) complex of the composition Zn3(tacpd)2Cl6 but no discrete complexes with Ni(II) and Cu(II) ions. The H-1 and C-13 NMR spectra indicated that the zinc complex is stable in N,N-dimethylformamide and formulated as [Zn(tacpd)Cl]2[ZnCl4] in which [Zn(tacpd)Cl]+ assumes a tetrahedral structure formed by the chloride ion and three nitrogens of tacpd.