Described herein is a copper-catalyzed efficient oxidative dearomatized functionalization of indoles by using alcohols as the nucleophiles. Various 3-alkoxy-2-oxindoles were accessible with good isolated yields. The synthetic potential applications are demonstrated by the large-scale reaction, as well as the derivatization of the desired 3-alkoxy substituted-2-oxindole products.
The rhodium(II) carbenoid cyclization–cycloaddition cascade of α-diazo dihydroindolinones for the synthesis of novel azapolycyclic ring systems
作者:Dylan B. England、James M. Eagan、Gokce Merey、Olcay Anac、Albert Padwa
DOI:10.1016/j.tet.2007.10.038
日期:2008.2
Tandem carbonylylide formation-1,3-dipolar cycloaddition of alpha-diazo N-acetyl-tetrahydro-beta-carbolin-1-one derivatives occur efficiently in the presence of a dirhodium catalyst to afford bimolecular cycloadducts in high yield. The Rh(II)-catalyzed reaction also takes place intramolecularly to give products derived from trapping of the carbonylylide dipole with a tethered alkene. The power of