Bichromophoric fluorescent photolabile protecting group for alcohols and carboxylic acids
作者:Selvanathan Arumugam、Vladimir V. Popik
DOI:10.1039/c1pp05317e
日期:2012.3
Novel bichromophoric fluorescent photolabile protecting group, (5-dansyloxy-3-hydroxynaphthalen-2-yl)methyl (DNS-NQMP), allows for the independent photochemical release and fluorescent imaging of caged substrates. Irradiation of DNS-NQMP-caged alcohols and carboxylic acids with 300 or 350 nm light results in fast (krelease ~ 105 s-1), efficient (Φ = 0.2), and quantitative release of the substrates. This uncaging chemistry is compatible with aqueous media and DNS-NQMP-protected hydroxy compounds are hydrolytically stable at neutral pH. Upon excitation with 400 nm light, caged compounds show intense green emission (λmax = 559 nm) with 21% fluorescence quantum yield. Fluorescent readout conducted using 400 nm or longer wavelengths does not cause substrate release. The DNS-NQMP chromophore retains its fluorescent properties after photo-uncaging reaction.
新型双色荧光光敏保护基团,(5-丹磺酰氧基-3-羟基萘-2-基)甲基(DNS-NQMP),实现了笼蔽底物的独立光化学释放和荧光成像。以300或350纳米波长光照射DNS-NQMP笼蔽的醇和羧酸,可快速(k释放 ~ 10^5 s^-1)、高效(Φ = 0.2)及定量地释放底物。这种开笼化学与水相介质兼容,且DNS-NQMP保护的羟基化合物在中性pH下水解稳定。以400纳米光激发,笼蔽化合物显示强烈的绿色发射(λmax = 559 nm),荧光量子产率为21%。使用400纳米或更长波长进行的荧光读出不会导致底物释放。DNS-NQMP生色团在光开笼反应后保留其荧光特性。