微波辅助钯介导的吡唑并有效合成[3,4 b ]吡啶,吡唑并[3,4- b ]喹啉,吡唑并[1,5-一个]嘧啶和吡唑并[1,5-一个]喹唑啉†
摘要:
开发了一种高效的方法,用于在微波辐射下通过钯催化的β-卤化基/芳基醛与3-氨基吡唑/ 5-氨基吡唑的钯催化无溶剂反应合成吡唑稠合杂环。该方法适用于有效合成各种取代的吡唑并[3,4- b ]吡啶,吡唑并[3,4- b ]喹啉,吡唑并[1,5- a ]嘧啶和吡唑并[1,5-]。一]喹唑啉。合成的吡唑融合化合物中的四种显示出的体外细胞毒活性几乎与药物阿霉素对宫颈HeLa癌细胞系和前列腺DU 205癌细胞系相当。
cascade 6-endo-dig cyclizationreaction 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