Facile synthesis of 1,3,4-oxadiazoles via iodine promoted oxidative annulation of methyl-azaheteroarenes and hydrazides
作者:Zhi-Hao Shang、Ji-Na Sun、Jiang-Shan Guo、Yuan-Yuan Sun、Wei-Zhao Weng、Zhen-Xiao Zhang、Zeng-Jing Li、Yan-Ping Zhu
DOI:10.1016/j.tet.2019.130887
日期:2020.2
An oxidative sp3 C–H bond of methyl-azaheteroarenes protocol was reported for the synthesis of 1,3,4-oxadiazoles via [4 + 1] annulation with hydrazides. This protocol enables 1,3,4-oxadiazole and quinoline linked diheterocycles via selective oxidation of sp3 C–H bond of methyl-azaheteroarenes in the presence of I2-DMSO. The reaction has a broad substrate scope and good functional group tolerance for
据报道,甲基[azazeteroarenes]协议的氧化sp 3 C–H键可通过[4 +1]酰肼环合反应合成1,3,4-恶二唑。该方案通过在I 2 -DMSO存在下对甲基-氮杂杂环芳烃的sp 3 C–H键进行选择性氧化来实现1,3,4-恶二唑和喹啉连接的二杂环。该反应具有广泛的底物范围,并且对甲基-氮杂环杂芳烃和酰肼具有良好的官能团耐受性。