Efficient Synthesis of the Indoloazocine Framework via Intramolecular Alkyne Carbocyclization
摘要:
A microwave-assisted protocol based on an Hg(OTf)(2) catalyzed intramolecular alkyne carbocyclization reaction was developed for selective construction of the indoloazocine core.
Metal‐Free Dearomatization: Direct Access to Spiroindol(en)ines in Batch and Continuous‐Flow
作者:Prabhat Ranjan、Gerardo M. Ojeda、Upendra K. Sharma、Erik V. Van der Eycken
DOI:10.1002/chem.201805945
日期:2019.2.18
A metal‐free, phosphine‐catalyzed intramolecular “umpolung Michael addition” on alkynes to form spiroindol(en)ines is reported. This nucleophilic catalysis enables the formation of a wide scope of five‐ and six‐membered spiroindol(en)ines in moderate to excellent yields in batch as well as under continuous‐flow conditions. Triphenylphosphine‐catalyzed nucleophilic activation of alkynes allows the exclusive