here a palladium(II)-catalyzed oxidative cyclization reaction of N-allylimines derived from methyl ketones, typically acetophenones, affording pyrrole derivatives at room temperature under oxygen atmosphere. The reaction likely proceeds through α-palladation of the imine followed by olefin migratory insertion and β-hydride elimination, thus representing a new example of aerobicdehydrogenative Heck cyclization
An efficient, noble-metal-free formal [4+2] cycloaddition reaction between ketones and imines was developed for synthesizing poly-substituted pyridines, whereby two sequential C−C bonds are formed.
Photochemically Produced Aminocyclobutanes as Masked Dienes in Thermal Electrocyclic Cascade Reactions
作者:Luke D. Elliott、Kevin I. Booker-Milburn
DOI:10.1021/acs.orglett.9b00211
日期:2019.3.1
involving the in situ formation of a cyclobutene, followed by electrocyclic ring opening, Diels–Aldercycloaddition, and subsequent lactamization. This combination of excited state photochemistry and thermal electrocyclic cascade reactions allows simple planar molecules to be rapidly transformed into sp3-rich scaffolds.