The stereochemistry of the addition of titanium enolates of N- propionyl-oxazolidin-2-ones to 5- and 6-membered N-acyliminium ions

Article abstract of DOI:10.1016/S0040-4039(99)00398-6

The stereochemistry of the addition of the N-propionyl titanium enolates 2a and 2b to 5- and 6-membered 2-ethoxyearbamates 1a-f was investigated. The addition proceeded stereoselectively to afford the corresponding (2S,1'S)-2- substituted pyrrolidines as