[3+2] Cycloaddition of N-Aminopyridines and Perfluoroalkynylphosphonates: Facile Synthesis of Perfluoroalkylated Pyrazolo[1,5-a]pyridines Containing a Phosphonate Moiety
作者:Hui Zhang、Weiguo Cao、Qi Huang、Dong He、Jing Han、Jie Chen、Weimin He、Hongmei Deng、Min Shao
DOI:10.1055/s-0037-1610443
日期:2018.9
3-Zwitterions generated from N-aminopyridines in the presence of base are trapped by perfluoroalkynylphosphonates to yield a variety of perfluoroalkylated pyrazolo[1,5-a]pyridine derivatives bearing a phosphonate group. The salient features of these [3+2] cycloadditions include operational simplicity, good tolerance of functional groups, and good to excellent yields at room temperature. 1,3-Zwitterions generated
§对这项工作有同等贡献。 抽象的 由N-氨基吡啶在碱存在下产生的1,3-两性离子被全氟炔基膦酸酯捕获,得到各种带有膦酸酯基团的全氟烷基化吡唑并[1,5- a ]吡啶衍生物。这些[3 + 2]环加成反应的显着特征包括操作简便,对官能团的良好耐受性以及在室温下良好至优异的收率。 由N-氨基吡啶在碱存在下产生的1,3-两性离子被全氟炔基膦酸酯捕获,得到各种带有膦酸酯基团的全氟烷基化吡唑并[1,5- a ]吡啶衍生物。这些[3 + 2]环加成反应的显着特征包括操作简便,对官能团的良好耐受性以及在室温下良好至优异的收率。