Sequential addition of ketone enolates to allyl acetates bearing an ester, followed by reduction and cyclization provides a variety of substituted alpha-alkylidene-delta-valerolactones.
Palladium catalyzed cyclizations of oximeesters with 1,1-disubstituted alkenes: synthesis of α,α-disubstituted dihydropyrroles and studies towards an asymmetric protocol
作者:Adele Faulkner、James S. Scott、John F. Bower
DOI:10.1039/c2cc38944d
日期:——
efficient Pd-catalyzed cyclizations of oxime esters with 1,1-disubstituted alkenes as the basis of a general entry to alpha,alpha-disubstituted pyrrolidine derivatives. We also demonstrate that catalytic asymmetric variants of this chemistry are feasible by employing a suitable chiral ligand.