Base-Promoted Isomerization of <i>cis</i>-4-Formyl-2-azetidinones: Chemoselective <i>C</i>4-Epimerization vs Rearrangement to Cyclic Enaminones
作者:Benito Alcaide、Moustafa F. Aly、Carolina Rodríguez、Alberto Rodríguez-Vicente
DOI:10.1021/jo991984h
日期:2000.6.1
N-(p-methoxyphenyl)-beta-lactams can be used, and (ii) transformation is less compatible with heteroatomic substituents bonded to the C3 position of the 2-azetidinone ring. A highly general solution to these problems relies on the use of sodium carbonate as the isomerization reagent in different solvents. We also describe a novel base-promotedrearrangement of the beta-lactam ring to cyclic enaminones 6