Enantioselective assembly of functionalized carbocyclic spirooxindoles using an<scp>l</scp>-proline derived thiourea organocatalyst

Abstract

Enantioselective sequential vinylogous Michael addition–cyclization reactions of vinyl malononitriles with isatylidene malononitrile were accomplished using<sc>l</sc>-proline derived bifunctional thiourea.