We developed a green method for the synthesis of spiro[4.5]trienones through an electrochemical oxidative halocyclization with N-aryl alkynamides. This reaction was conducted under metal-catalyst- and exogenous-oxidant-free conditions at room temperature. Using readily available LiCl, LiBr, and LiI as the halogen source, a variety of dearomative halo-spirocyclization products were obtained in good
Metal‐Free ipso‐Halocyclization of N‐Arylpropynamides Using Hypervalent Iodine(III) Reagents under Aqueous Condition
作者:Pankaj Jangir、Kalu Ram Bajya、Akshay S. Pathare、Mohammad Sodoor、Rinku Saini、Mukesh Purohit、Sermadurai Selvakumar
DOI:10.1002/ejoc.202400203
日期:2024.5.27
An efficient intramolecular ipso-halocyclization of para-unsubstituted N-arylpropynamides proceeds using readily available hypervalentiodinereagents as oxidant and potassium halides as halogen source under aqueous medium. This method shows a broad substrate scope and doesn't require any metal catalysts.