Reactions of alpha-ethoxycarbamates (alpha-ethoxylated derivatives of N-ethoxycarbonylpyrrolidine, -piperidine, and -hexamethyleneimine) with various enolates (enol acetates, enol ethers, or tin(II) enolates of ketones) in the presence of tin(II) triflate are described.
Trimethylsilyl Trifluoromethanesul Fonate (Tmsotf) Catalyzed Amidoalkylation of Silylenolethers. Stereocontrolled Syntheses of (+/-)-Sedamine and (+/-)-Norsedamine