E. Lorthiois et al., DIASTEREOSELECTIVE AND ENANTIOSELECTIVE INTRAMOLECULAR AMINO-ZINC-ENOLATE CARBOMETALATION REACTIONS - A NEW POLYSUBSTITUTED PYRROLIDINES SYNTHESIS, Journal of organic chemistry, 63(8), 1998, pp. 2442-2450
The amino-zinc-enolate cyclization allowed a new and straightforward r
oute to polysubstituted pyrrolidines from simple starting materials. F
rom this study, we have been able to determine, for the first time, th
e stereochemical influence of the substituents on the ring in the carb
ocyclization reaction. The diastereoselectivity thus obtained was expl
ained by a chairlike amino-zinc-enolate transition state.