The role of protecting groups in the formation of organogels through a nano-fibrillar network formed by self-assembling terminally protected tripeptides
作者:Apurba K. Das、Partha Pratim Bose、Michael G.B. Drew、Arindam Banerjee
DOI:10.1016/j.tet.2007.05.045
日期:2007.7
form gels in various aromatic solvents including benzene, toluene, xylene, and chlorobenzene. It has been found that the protecting groups play an important role in the formation of organogels. It has been observed that, if the C-terminal has been changed from methyl ester to ethyl ester the gelation property does not change significantly (keeping the N-terminal protecting group same), while the change
已经研究了一系列八种合成的自组装末端封闭的三肽用于凝胶化。其中一些在各种芳香族溶剂(包括苯,甲苯,二甲苯和氯苯)中形成凝胶。已经发现保护基在有机凝胶的形成中起重要作用。已经观察到,如果C-末端已经从甲酯变成乙基酯,则凝胶化性质不会显着改变(保持N-末端保护基相同),而保护基团从乙酯变成异丙基。酯完全消除了胶凝特性。同样,保持相同的C末端保护基团(甲酯),凝胶化研究结果表明,N末端保护基Boc-(tert的取代-丁氧基羰基)到Cbz-(苄氧基羰基)的确改变了凝胶化性质,而从Boc-变为新戊酰基(Piv-)或乙酰基(Ac-)则完全消除了凝胶化性质。对两种肽的干燥凝胶的形态学研究表明,缠结的纳米原纤维网络的存在可能导致凝胶化。凝胶的FTIR研究表明,在凝胶化过程中形成了分子间氢键网络。这些处于不同状态(干燥的凝胶,凝胶和散装固体)的胶凝剂肽的X射线粉末衍射研究结果表明,湿凝胶中的结构与干燥的凝胶