Photoreleasable Protecting Groups Triggered by Sequential Two-Photon Absorption of Visible Light: Release of Carboxylic Acids from a Linked Anthraquinone-<i>N</i>-Alkylpicolinium Ester Molecule
作者:Matthew D. Thum、Daniel E. Falvey
DOI:10.1021/acs.jpca.8b00657
日期:2018.3.29
protecting group activated by sequential absorption of two visible photons is designed, synthesized, and tested. Specifically, an anthraquinone-based chromophore is covalently attached to an N-alkylpicolinium ester. Photolysis of this linked system results in the clean release of a corresponding carboxylic acid. Through product analysis, laser flash photolysis, and steady-state UV–vis spectroscopy, it
设计,合成和测试了通过依次吸收两个可见光子而激活的可释放光的保护基。具体地,基于蒽醌的发色团共价附于N-烷基吡啶啉酯。该连接系统的光解导致相应羧酸的干净释放。通过产品分析,激光闪光光解和稳态紫外可见光谱,可以证明羧酸盐离子的释放受两个光子顺序吸收的影响。最初的光化学步骤导致蒽醌生色团还原为相应的氢醌。后者要么与O 2反应 再生原料,或者吸收第二个光子会导致电子转移至吡啶鎓基团,从而触发C–O键断裂并释放出羧酸盐。