Synthesis of fluorescent trisubstituted oxazoles via a facile tandem Staudinger/aza-Wittig/isomerization reaction
作者:Hai Xie、Yong Rao、Ming-Wu Ding
DOI:10.1016/j.dyepig.2016.12.040
日期:2017.4
A new facile synthesis of trisubstituted oxazoles starting from azides was developed. The reactions of azides with triphenyl phosphine afforded the corresponding 2,4,5-trisubstituted oxazole derivatives via tandem Staudinger, aza-Wittig and isomerization reaction either thermally or under basic conditions. Properties of the oxazole derivatives were surveyed and some of the examples showed reasonable
从叠氮化物开始的新的三取代恶唑的简便合成方法得到了发展。叠氮化物与三苯基膦的反应在热条件下或在碱性条件下通过串联的Staudinger,aza-Wittig和异构化反应得到相应的2,4,5-三取代的恶唑衍生物。研究了恶唑衍生物的性质,一些实施例显示出合理的荧光。当恶唑环上的2-和5-取代基为芳族基团(ε = 2.3-3.0×10 4 mol -1 dm 3 cm -1和Φ时,观察到最大的荧光强度 =相对于硫酸奎宁0.25-0.29)。但是,当2-或5-取代基是H或烷基时,荧光强度降低。