Mechanistic Insights into Rapid Generation of Nitroxyl from a Photocaged <i>N</i>-Hydroxysulfonamide Incorporating the (6-Hydroxynaphthalen-2-yl)methyl Chromophore
作者:Ruth B. Cink、Yang Zhou、Lili Du、Mohammad S. Rahman、David Lee Phillips、M. Cather Simpson、Alexander J. Seed、Paul Sampson、Nicola E. Brasch
DOI:10.1021/acs.joc.1c00457
日期:2021.6.18
Evidence is presented for C–O/N–S bond heterolysis occurring directly from the singlet excited state of the N-deprotonated parent molecule on the picosecond time scale, using femtosecond time-resolved transient absorption spectroscopy, to give a carbocation and 1NO–. This is consistent with the observation of significant fluorescence quenching when HNO is generated. The carbocation intermediate reacts rapidly
HNO 是一种高活性分子,在治疗心力衰竭方面显示出前景。需要在精确的空间和时间控制下快速释放 HNO 的分子来研究这种信号分子的生物学。(Hydroxynaphthalen-2-yl)methyl-photocaged N -hydroxysulfonamides是一类新型的光活性 HNO 发生器。最近,研究表明,N-羟基磺酰胺的(6-羟基萘-2-基)甲基(6,2-HNM)-光笼化衍生物结合了三氟甲磺酰胺氧基(1) 定量生成 HNO。现在已经对该系统进行了机理研究,并表明基态质子化状态在是否发生协同异溶 C-O/N-S 键裂解以释放 HNO 与不希望的 O-N 键裂解之间起着关键作用。1的N-去质子化可以通过向非质子溶剂中加入水性缓冲液或羧酸盐来实现。证据提出了一种用于C-O / N-S键heterolysis直接从单重激发态产生的Ñ -deprotonated上皮秒的时间尺度母体分子,使