Preparation of hexaaza and heptaaza macrocycles functionalized with a single aminoalkyl pendant armElectronic supplementary information (ESI) available: preparative details for compounds which have been reported previously. See http://www.rsc.org/suppdata/ob/b2/b210663a/
作者:Zhibo Zhang、Satu Mikkola、Harri Lönnberg
DOI:10.1039/b210663a
日期:2003.2.27
A practical and reproducible route for the preparation of 1,4,7,10,13,16,19-heptaazacyclohenicosane (1), 1,4,7,10,13,16-hexaazacyclooctadecane (2), and 1,4,7,10,13,17-hexaazacycloicosane (3) bearing a single N-(2-aminoethyl) pendant arm has been developed. Richman–Atkins cyclization in the presence of caesium carbonate was applied to construct the macrocycle from 3-benzoyl-N1,N5-ditosyl-3-azapentane-1,5-diamine and the appropriate fully N-tosylated Nα,Nω-bis(2-mesyloxyethyl) tri- or tetra-amine. The benzoyl group was selectively removed with potassium tert-butoxide, and the exposed nitrogen atom was reacted with N-tosylaziridine. The tosyl protections were removed with hydrogen bromide in acetic acid, and the product was converted to a free base with the aid of a strong anion exchange resin (OH− form).
本研究开发了一条实用且可重复的路线,用于制备具有单个 N-(2-氨基乙基)悬臂的 1,4,7,10,13,16-heptaazacyclohenicosane (1)、1,4,7,10,13,16-hexaazacyclooctadecane (2) 和 1,4,7,10,13,17-hexaazacycloicosane (3)。在碳酸铯存在下,采用 Richman-Atkins 环化技术,由 3-苯甲酰基-N1,N5-二对甲苯磺酰基-3-氮杂戊烷-1,5-二胺和适当的完全 N-对甲苯磺酸化的 Nα,Nω-双(2-甲酰氧基乙基)三胺或四胺构建大环。苯甲酰基被叔丁醇钾选择性地去除,暴露的氮原子与 N-对甲苯磺酰基氮丙啶反应。在乙酸中用溴化氢除去甲苯基保护层,然后借助强阴离子交换树脂(OH- 形式)将产物转化为游离碱。