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
Substitution and Cyclization Reactions Involving the Quasi-Antiaromatic 2<i>H</i>-Indol-2-one Ring System
作者:Dylan B. England、Gokce Merey、Albert Padwa
DOI:10.1021/ol7016438
日期:2007.9.1
The quasi-antiaromatic 2H-indol-2-one ringsystem is readily generated by treating a 3-hydroxy-substituted 1,3-dihydroindol-2-one with a Lewis acid. Stepwise addition of various pi-nucleophiles to the highly reactive 2H-indol-2-one system occurs smoothly to afford substituted oxindoles. The cyclization was also carried out in an intramolecular fashion to give spiro-substituted oxindoles in good yield