作者:Michal Szostak、Lei Yao、Jeffrey Aubé
DOI:10.1021/jo802192v
日期:2009.3.6
are typically hypersensitive to hydrolysis, a feature that has stringently limited their utility in water. We have synthesized a series of bridged lactams that contain a twisted amide linkage but exhibit enhanced stability in aqueous environments. Many of these compounds were extracted unchanged from aqueous mixtures ranging from the strongly basic to the strongly acidic. NMR experiments showed that tricyclic
含有非标准二面角的“扭曲”酰胺通常对水解敏感,这一特征严格限制了它们在水中的应用。我们合成了一系列桥接内酰胺,这些内酰胺含有扭曲的酰胺键,但在水性环境中表现出增强的稳定性。许多这些化合物是从强碱性到强酸性的水性混合物中原样提取的。核磁共振实验表明,三环内酰胺在极端 pH 值范围内会发生可逆水解,但该结构类别中的许多化合物在生理相关 pH 值条件下是无限稳定的;一个双环实例另外是水溶性的。我们研究了结构对酰胺键水解可逆性的影响,我们将其归因于氨基酸类似物的跨环性质。这些数据表明,这些类型的中桥内酰胺应该为研究扭曲酰胺在水性体系中的行为提供有用的平台。