[8-[Bis(carboxymethyl)aminomethyl]-6-bromo-7-hydroxycoumarin-4-yl]methyl Moieties as Photoremovable Protecting Groups for Compounds with COOH, NH<sub>2</sub>, OH, and C═O Functions
作者:Volker Hagen、Funda Kilic、Janina Schaal、Brigitte Dekowski、Reinhard Schmidt、Nico Kotzur
DOI:10.1021/jo100368w
日期:2010.5.7
exemplarily for caging of a carboxylic acid, an amine, a phenol, and a carbonyl compound. The caged compounds are efficiently photolyzed at long-wavelength UV/vis irradiation. Compared to the corresponding (6-bromo-7-hydroxycoumarin-4-yl)methyl (Bhc) derivatives, the novel coumarin-type caged compounds are distinguished by (i) dramatically increased solubilities in aqueous buffers, (ii) lower pKa values
我们引入了基于香豆素的可光活化保护基的变体,并将其示例性地用于羧酸,胺,苯酚和羰基化合物的笼蔽。笼状化合物可在长波紫外线/可见光照射下有效地光解。与相应的(6-bromo-7-hydroxycoumarin-4-yl)methyl(Bhc)衍生物相比,新型香豆素型笼状化合物的特征在于(i)在水性缓冲液中的溶解度显着提高,(ii)较低的p K a香豆素发色团的C 7羟基的最大分子量,因此允许在较低的pH下有效地释放光,并且(iii)在光保护的羰基化合物的情况下,具有更高的光解量子产率。光解的第一步以约10 9 s -1的速率常数发生。