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
A simple and versatile protocol for the preparation of 1,3-functionalized heterocycles utilizing benzoylpyruvates
作者:Jens M. J. Nolsöe、Anne Ertan、Mats Svensson、Dirk Weigelt
DOI:10.1002/jhet.448
日期:——
between benzoylpyruvates and various dinucleophiles in alcoholic solvent furnished the heterocyclic imprint in moderate to good yield. Combining a range of symmetric as well as nonsymmetric nitrogen/nitrogen or nitrogen/carbon centered dinucleophiles resulted in excellent regioselectivity. γ‐Difunctionalized fused pyrimidines, pyridazines, and pyridines were produced in this manner. The protocol was designed