109670-22-6Relevant academic research and scientific papers
Isocyanide-based multicomponent reactions: Concise synthesis of spirocyclic oxindoles with molecular complexity by using a [1,5]-hydrogen shift as the key step
Su, Shikuan,Li, Chunju,Jia, Xueshun,Li, Jian
supporting information, p. 5905 - 5909 (2014/05/20)
A 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 [1,5]-hydrogen shift, and group migration. The introduction of a special alkyl group to the allenoate is believed to play a key role in the cascade reaction. This method also features a broad substrate scope, which is particularly useful for the delivery of a large number of compounds. Shift your perspective! An unprecedented cascade reaction, under mild conditions, involving a double Michael addition, double cyclization, and double [1,5]-hydrogen shift, followed by group migration is disclosed. This reaction offers a fast and straightforward approach to unusual polycyclic spirooxindoles (see scheme).
