Regioselective Synthesis of Emission Color‐Tunable Pyrazolo[1,5‐a]pyrimidines with β,β‐Difluoro Peroxides as 1,3‐Bis‐Electrophiles
作者:Yangyang Ma、Yuanjin Chen、Leiyang Lv、Zhiping Li
DOI:10.1002/adsc.202100298
日期:2021.7
The synthesis and photophysical properties of fluorescent pyrazolo[1,5-a]pyrimidines (PPs) are explored. An array of 5,7-disubstituted fluorescent PPs are prepared selectively by using β,β-difluoro peroxides as the 1,3-bis-electrophiles. The synthesized PPs display a fairly significant stokes shift (up to 211 nm) and a large window of tunable emission wavelength that covers most of the visible spectrum
探讨了荧光吡唑并 [1,5-a] 嘧啶 (PP) 的合成和光物理特性。通过使用β , β-二氟过氧化物作为1,3-双亲电试剂,选择性地制备了一系列5,7-二取代荧光PP 。合成的 PP 显示出相当显着的斯托克斯位移(高达 211 nm)和覆盖大部分可见光谱(400 nm 至 800 nm)的可调发射波长的大窗口。理论计算表明,分子内电荷转移(ICT)能力对不同取代基的显着变化是颜色可调荧光发射的原因。