A new copper-catalyzed oxidativeringclosure of ethynyl anilides with diaryliodonium salts was developed for the highly modular construction of benzoxazines bearing a fully substituted exo double bond. The oxidative transformation includes an unusual 6-exo-dig cyclization step with the formation of C–O and C–C bonds.
Utilization of a Copper on Iron Catalyst for the Synthesis of Biaryl Systems and Benzoxazines via Oxidative Arylation of Anilide Derivatives
作者:Zoltán Novák、Anna Székely、Ádám Sinai、Edina Tóth
DOI:10.1055/s-0033-1338642
日期:——
Heterogeneous copper on iron catalyst serves as an efficient alternative copper source for arylation reactions using hypervalent iodonium salts. The copper(0) catalyst affords meta-arylation of pivalanilides, while 2-ethynylanilides undergo oxidative carboarylation–ring closure with diaryliodonium salts. Heterogeneous copper on iron catalyst serves as an efficient alternative copper source for arylation reactions