Highly Selective Addition of Chiral, Sulfonimidoyl Substituted Bis(allyl)titanium Complexes to N-Sulfonyl α-Imino Esters:  Asymmetric Synthesis of γ,δ-Unsaturated α-Amino Acids Bearing a Chiral, Electron-Withdrawing Nucleofuge at the δ-Position

Selective addition of the chiral, sulfonimidoyl substituted bis(allyl)titanium complexes 5a−d, which are configurationally labile in regard to the Cα-atoms, to N-toluenesulfonyl (Ts)-, N-2-trimethylsilylethanesulfonyl (SES)-, and N-tert-butylsulfonyl (Bus) α-imino ester (9a−c) in the presence of Ti(...

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