Synthesis of Diversified Pyrazolo[3,4-b]pyridine Frameworks from 5-Aminopyrazoles and Alkynyl Aldehydes via Switchable C≡C Bond Activation Approaches
作者:Xiao-Yu Miao、Yong-Ji Hu、Fu-Rao Liu、Yuan-Yuan Sun、Die Sun、An-Xin Wu、Yan-Ping Zhu
DOI:10.3390/molecules27196381
日期:——
cascade 6-endo-dig cyclization reaction was developed for the switchable synthesis of halogen and non-halogen-functionalized pyrazolo[3,4-b]pyridines from 5-aminopyrazoles and alkynyl aldehydes via C≡C bond activation with silver, iodine, or NBS. In addition to its wide substrate scope, the reaction showed good functional group tolerance as well as excellent regional selectivity. This new protocol
开发了级联6-endo-dig环化反应,用于从 5-氨基吡唑和炔基醛通过 C≡C 键活化与银、碘、或国家统计局。除了底物范围广外,该反应还表现出良好的官能团耐受性和优异的区域选择性。这个新的协议操纵了三种天然产物,以及碘功能化产物的芳基化、炔基化、烯基化和硒化。这些反应证明了这种新方法的潜在应用。