作者:Jian Wang、Jiang-Hua Li、Yidong Guo、Hongbo Dong、Qiang Liu、Xiao-Qi Yu
DOI:10.1021/acs.joc.0c01921
日期:2020.10.2
The direct amination of benzoxazoles at C2 using N-heterocycles as nitrogen sources has been developed for the first time. Several kinds of inexpensive oxidants and also electricity were effective for this transformation in the presence of 2,2,6,6-tetramethylpiperidine-N-oxyl. This metal-free and operationally simple reaction can afford a variety of important C,N′-linked bis-heteocycles in moderate
首次开发了使用N杂环作为氮源在C2处苯并恶唑的直接胺化反应。在2,2,6,6-四甲基哌啶-N-氧基的存在下,几种廉价的氧化剂以及电对这种转化有效。这种无金属且操作简单的反应可以在非常温和的反应条件下以中等到良好的产率提供各种重要的C,N'-连接的双杂环。事实证明,原位产生的氧铵盐对于这种转化很重要。