Lewis base promoted [4+2] annulation of oâacylaminoâaryl MoritaâBaylisâHillman carbonates with isatylidene malononitriles: facile access to spiro[indolinâ3,2'âquinoline] frameworks

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Lewis base promoted [4+2] annulation of oâacylaminoâaryl MoritaâBaylisâHillman carbonates with isatylidene malononitriles: facile access to spiro[indolinâ3,2'âquinoline] frameworks