Microwave-assisted benzyne-click chemistry: preparation of 1H-benzo[d][1,2,3]triazoles
作者:Haribabu Ankati、Ed Biehl
DOI:10.1016/j.tetlet.2009.06.004
日期:2009.8
[3+2] cycloadditions of various azides to benzyne, 3-methoxybenzyne, and 4,5-difluorobenzyne. In the three-component reaction, the aryne is generated, in the presence of an azide prepared in situ, by the reaction of an o-(trimethylsilylaryl) triflate with either CsF or KF/18-Crown-6. However, in the two-component reactions, a freshly prepared azide is added to the reaction vessel prior to aryne generation
苯并三唑是通过将各种叠氮化物进行三组分和两组分微波辅助的[3 + 2]环加成反应制得的。在三组分反应中,在原位制备的叠氮化物存在下,通过邻(三甲基甲硅烷基芳基)三氟甲磺酸酯与CsF或KF / 18-Crown-6的反应生成芳烃。然而,在两组分反应中,在生成芳烃之前,将新鲜制备的叠氮化物添加到反应容器中。当微波辅助反应在125°C下进行时,在15–20分钟内可获得良好至优异的苯并三唑收率。这些反应时间比使用常规加热进行的类似反应快得多。