Iodobenzene catalysed synthesis of spirofurans and benzopyrans by oxidative cyclisation of vinylogous esters
作者:Marsewi Ngatimin、Raphael Frey、Cecily Andrews、David W. Lupton、Oliver E. Hutt
DOI:10.1039/c1cc15015d
日期:——
Vinylogous esters bearing para or meta methoxy benzyl groups undergo oxidativecyclisation with 5-20 mol% iodobenzene and m-CPBA to give spirofuran or benzopyran containing heterocycles. The reaction allows rapid generation of skeletal complexity in good to excellent yields via a noveloxidativecyclisation.
Iodobenzene-Catalyzed Oxabicyclo[3.2.1]octane and [4.2.1]Nonane Synthesis via Cascade C–O/C–C Formation
作者:Marsewi Ngatimin、Raphael Frey、Alison Levens、Yuji Nakano、Marcin Kowalczyk、Kristina Konstas、Oliver E. Hutt、David W. Lupton
DOI:10.1021/ol4029308
日期:2013.11.15
via C–C and C–O bond formation has been achieved with electron rich aromatic groups and vinylogous esters acting as independent nucleophiles. The reaction provides oxabicyclo[3.2.1]octanes and [4.2.1]nonanes from commercially available 3-alkoxy cycohexen-2-ones in three steps.