Unraveling the Photodeprotection Mechanism of Anthraquinon-2-ylmethoxycarbonyl-Caged Alcohols Using Time-Resolved Spectroscopy
作者:Yan Guo、Qingqing Song、Jialin Wang、Jiani Ma、Xiting Zhang、David Lee Phillips
DOI:10.1021/acs.joc.8b02252
日期:2018.11.2
Anthraquinone (AQ) compounds have been used as photolabile protecting groups (PPGs) to protect alcohols, ketones, and carboxylic acids. However, because of the lack of direct spectroscopic information for the transient species and intermediates related with the deprotection reaction(s), the photorelease mechanism(s) of these systems are still largely unknown. In this contribution, we detail a time-resolved
蒽醌(AQ)化合物已被用作光不稳定的保护基(PPG),以保护醇,酮和羧酸。然而,由于缺乏与脱保护反应有关的过渡物种和中间体的直接光谱信息,这些系统的光致释放机理仍然是很大程度上未知的。在这项贡献中,我们详细介绍了使用蒽醌保护的半乳糖(1)和腺苷(2)进行的时间分辨光谱研究,以研究这类AQ-PPG的光脱保护反应机理。发现在THF-H 2 O溶剂中,生成1和2的酮基自由基种类被发现是反应性中间体,然后形成二羟基蒽物质。然后伴随脱羧过程发生光脱保护。这些结果使人们对AQ-PPG的工作原理有了更深入的了解,并将有助于协助选定的蒽醌衍生物作为PPG平台的设计和应用,特别是在与生物系统更相关的水性环境中。