A facile and efficient synthesis of 3-spirocyclopentene-2-oxindoles via palladium mediated vinylcyclopropane-cyclopentene rearrangement of oxindole derived vinylcyclopropanes

Palladium catalyzed synthesis of a number of novel 3-spirocyclopentene-2-oxindoles in good yields has been accomplished from geometrically strained 3-vinylcyclopropane-2-oxindole via vinylcyclopropane-cyclopentene rearrangement.