ChemInform Abstract: Unusual Formal [1 + 4] Annulation Through Tandem P(NMe2)3-Mediated Cyclopropanation/Base-Catalyzed Cyclopropane Rearrangement: Facile Syntheses of Cyclopentenimines and Cyclopentenones.
A formal [1+4] annulation of α-dicarbonyl compounds with 1,1-dicyano-1,3-dienes is realized, leading to facile syntheses of cyclopentenimines and cyclopentenones in a unique manner.