Synthesis of Pyrido[2,3‐
<i>b</i>
]indole Derivatives via Rhodium‐Catalyzed Cyclization of Indoles and 1‐Sulfonyl‐1,2,3‐triazoles
作者:Shengguo Duan、Yuehui An、Bing Xue、Yidian Chen、Wan Zhang、Ze‐Feng Xu、Chuan‐Ying Li
DOI:10.1002/adsc.201901599
日期:2020.4.27
Acyloxy‐substituted α,β‐unsaturated imines generated in situ from triazoles can act as aza‐[4 C] synthons and be trapped by indoles in a stepwise [4 + 2] cycloaddition reaction, thus providing rapid access to valuable pyrido[2,3‐b]indoles in high yields. Attractive features of this reaction system include operational simplicity, readily available substrates, construction of sterically demanding quaternary
由三唑原位生成的酰氧基取代的α,β-不饱和亚胺可以作为aza- [4 C]合成子,并被吲哚在逐步[4 + 2]环加成反应中捕获,从而提供了快速获取有价值的吡啶基[2, 3‐ b ]吲哚高产。该反应系统的吸引人的特征包括操作简便,易于获得的底物,空间要求严格的四元中心的构建以及使用三氟甲磺酸酯的便捷衍生作用。