been converted into enantiomericallypure endocyclic 2-alkenyl sulfoximines. Titanated derivatives thereof undergo highlydiastereoselective γ-hydroxy-alkylation reactions with various amino aldehydes yielding isomerically pure vinyl sulfoximines, which can be cyclized by N-deprotection. The resulting heterobicyclic systems are expected to be interesting scaffolds for the synthesis of topological mimetics
2-alkenyl sulfoximines for the synthesis of highlysubstituted aza(poly)cyclic ring systems is described. The method relies on a one-pot combination of a reagent-controlled allyl transfer reaction to alpha- or beta-amino aldehydes, followed by a Michael-type cyclization of the intermediate vinyl sulfoximines generated in the first step. The sulfur-free target compounds are preferentially obtained by