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6π-Electrocyclization of conjugated trienes derived in-situ from the Morita-Baylis-Hillman carbonates of N-methylisatins afforded dispirocyclohexadiene bisoxindoles in good yields. Two stereoisomers (cis and trans) were formed in almost equal amounts.
The reactivity pattern of E/Z isomerized (polaraziable CC bond) alkyl 2-cyano-2-(2-oxoindolin-3-ylidene)acetate is studied with azomethine ylide generated in situ from decarboxylative condensation of isatin and sarcosine or proline yielding stereochemically different novel dispirobisoxindole derivatives with creation of up to four stereogenic centers through [3+2] cycloaddition reaction. Investigating...
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