Isocyanide-Based Multicomponent Reactions: Concise Synthesis of Spirocyclic Oxindoles with Molecular Complexity by Using a [1,5]-Hydrogen Shift as the Key Step
作者:Shikuan Su、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1002/chem.201402576
日期:2014.5.12
concise multicomponent reaction of isocyanide, α‐substituted allenoate, and methyleneindolinone has been disclosed. This protocol provides a fast and straightforward approach to synthesize unusual tricyclic oxindoles in an efficient and atom‐economic manner. Mechanistically, the present cycloaddition may proceed through a cascade sequence involving double Michael addition, double cyclization, double
已公开了异氰酸酯,α-取代的脲基酸酯和亚甲基吲哚满酮的简明多组分反应。该协议提供了一种快速,直接的方法,以高效且原子经济的方式合成不寻常的三环羟吲哚。从机理上讲,目前的环加成反应可能是通过级联序列进行的,该级联序列包括两次迈克尔加成,两次环化,两次[1,5]-氢转移和基团迁移。据信将特殊的烷基引入到烯丙酸酯中在级联反应中起关键作用。该方法还具有广泛的底物范围,这对于输送大量化合物特别有用。