Mass spectroscopic investigation of bis-1,3-urea calix[4]arenes and their ability to complex N-protected α-amino acids
作者:Sean P. Bew、Adam W. J. Barter、Sunil V. Sharma
DOI:10.1007/s10847-009-9687-6
日期:2010.2
We report the ability of urea’s appended onto the upper-rim of conformationally locked ‘cone’ calix[4]arenes to show a preference for binding specific N-protected α-amino acids. Superior complexation (as judged by mass spectroscopy) between N-protected α-amino results and bis-1,3-N-benzylureas calix[4]arenes was observed when methylene bridges were present between the calix[4]arene ‘host’ and the urea motif. Interestingly we also demonstrate that subjecting mixtures of structurally diverse N-Fmoc-α-amino acids to a single bis-1,3-N-benzylurea derived calix[4]arene allows, in some cases, the calix[4]arene ‘host’ to selectively ‘pick out’ and complex a specific N-Fmoc amino acid from the mixture.
我们报告了添加到构象锁定的 "锥形 "钙[4]烯上缘的脲能够优先结合特定的 N 保护α-氨基酸。当钙钛矿[4]炔 "宿主 "和脲基之间存在亚甲基桥时,N-受保护的α-氨基酸和双-1,3-N-苄基脲钙钛矿[4]炔之间的复合物(根据质谱判断)会表现得更好。有趣的是,我们还证明,将结构各异的 N-Fmoc-α-氨基酸混合物置于单一的双-1,3-N-苄基脲衍生的钙[4]炔中,在某些情况下,钙[4]炔 "宿主 "可以从混合物中选择性地 "挑选 "出特定的 N-Fmoc 氨基酸并将其络合。