title: [8-[Bis(carboxymethyl)aminomethyl]-6-bromo-7-hydroxycoumarin-4-yl]methyl moieties as photoremovable protecting groups for compounds with COOH, NH2, OH, and C=O functions.
abstract: We introduce a variant of coumarin-based photoactivatable protecting groups and use it 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 pK(a) values of the C7 hydroxyl of the coumarin chromophore, thus permitting efficient photorelease at lower pH, and (iii) higher photolysis quantum yields in the case of photoprotected carbonyl compounds. The primary step of the photocleavages occurs with rate constants of about 10(9) s(-1).
authors.affiliation: Leibniz-Institut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, 13125 Berlin, Germany. hagen@fmp-berlin.de
authors.forename: Volker
authors.initials: V
authors.lastname: Hagen
authors.forename: Funda
authors.initials: F
authors.lastname: Kilic
authors.forename: Janina
authors.initials: J
authors.lastname: Schaal
authors.forename: Brigitte
authors.initials: B
authors.lastname: Dekowski
authors.forename: Reinhard
authors.initials: R
authors.lastname: Schmidt
authors.forename: Nico
authors.initials: N
authors.lastname: Kotzur
mesh_terms: D000588:Amines / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry*; D015394:Molecular Structure; D010636:Phenols / Q000737:chemistry*; D010782:Photolysis; D012995:Solubility; D014468:Umbelliferones / Q000737:chemistry*
chemical_list: D000588:Amines; D002264:Carboxylic Acids; D010636:Phenols; D014468:Umbelliferones; C031477:7-hydroxycoumarin