A facile and regioselective synthesis of 1,4-disubstituted 1,2,3-triazoles using click chemistry
作者:Dalip Kumar、V. Buchi Reddy、Rajender S. Varma
DOI:10.1016/j.tetlet.2009.02.107
日期:2009.5
The reaction of α-tosyloxy ketones, sodium azide, and terminal alkynes in presence of copper(I) in aqueous polyethylene glycol afforded regioselectively 1,4-disubstituted 1,2,3-triazoles in good yield at ambient temperature. The one-pot exclusive formation of 1,4-disubstituted 1,2,3-triazoles involves in situ formation of α-azido ketones, followed by cycloaddition reaction with terminal alkyne. The
α-甲苯磺酰氧基酮,叠氮化钠和末端炔在铜(I)存在下在聚乙二醇水溶液中反应在环境温度下以良好的产率提供区域选择性的1,4-二取代的1,2,3-三唑。一锅独家形成1,4-二取代1,2,3-三唑涉及原位形成α-叠氮基酮,然后与末端炔烃进行环加成反应。通过合成一系列不同的1,4-二取代的1,2,3-三唑,证明了这种一锅法的普遍性。