N-Benzyloxycarbonylamino sulfones react with aromatic ketones in the presence of catalytic amount of boron trifluoride-diethyl ether at room temperature to afford the corresponding protected β-amino ketones in high yields (71-87%). α-amido sulfones - stable imine precursors - aromatic ketones - BF3˙OEt2 - Lewis acids - β-amino ketones Part 200 in the series ‘Studies on Novel Synthetic Methodologies’
Reaction of Allylzinc Reagents and Zinc Enolates of Ketones with α-Amidoalkylphenyl Sulfones
作者:Marino Petrini、Roberto Profeta、Paolo Righi
DOI:10.1021/jo025606f
日期:2002.6.1
Alpha-amidoalkylphenyl sulfones behave as N-acylimino equivalents in the reaction with functionalized allylzinc reagents. The addition products obtained using the zinc derivative of ethyl 2-(bromomethyl)acrylate can be readily transformed into alpha-methylene-gamma-lactams using different cyclization procedures. The allylzinc reagent obtained from 3-bromo-1-acetoxy-1-propene directly affords protected