Interdigitated Hydrogen Bonds: Electrophile Activation for Covalent Capture and Fluorescence Turn-On Detection of Cyanide
作者:Junyong Jo、András Olasz、Chun-Hsing Chen、Dongwhan Lee
DOI:10.1021/ja312313f
日期:2013.3.6
Hydrogen-bonding promoted covalent modifications are finding useful applications in small-molecule chemical synthesis and detection. We have designed a xanthene-based fluorescent probe 1, in which tightly held acylguanidine and aldehyde groups engage in multiple intramolecular hydrogen bonds within the concave side of the molecule. Such an interdigitated hydrogen bond donor-acceptor (HBD-HBA) array
氢键促进的共价修饰在小分子化学合成和检测中得到了有用的应用。我们设计了一种基于呫吨的荧光探针 1,其中紧密结合的酰基胍和醛基在分子凹面内形成多个分子内氢键。这种交叉氢键供体-受体(HBD-HBA)阵列为内部键旋转施加了显着的能量势垒(ΔG(‡)= 10-16 kcal mol(-1))以协助结构预组织并有效地将亲电羰基极化为CN(-) 在水性环境中的亲核攻击。这种共价修饰重定向了氰醇加合物 2 的去激发途径,以在 λmax = 440 nm 处引起荧光强度的大(> 7 倍)增强。