作者:Michelle Tran-Dubé、Neal Sach、Sacha Ninkovic、John F. Braganza、Qinhua Huang、Benjamin Johnson、Michael Raymond Collins
DOI:10.1016/j.tetlet.2012.06.035
日期:2012.8
The synthesis of 3-(6-chloropyrazin-2-yl)pyrazolo[1,5-a]pyridine from an enol ether and 4-substituted 1-aminopyridinim iodides via a 3+2 cycloaddition is presented. A high throughput reaction screen was used to optimize the yield of the cycloaddition. This protocol is operationally simple, scalable, proceeds at room temperature, and the reaction profiles are very clean.
提出了由烯醇醚和4-取代的1-氨基吡啶碘代碘化物通过3 + 2环加成反应合成3-(6-氯吡嗪-2-基)吡唑并[1,5- a ]吡啶。高通量反应筛用于优化环加成的产率。该方案操作简单,可扩展,在室温下进行,反应曲线非常干净。