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AgBF<sub>4</sub> catalyzed regio- and stereoselective synthesis of <i>trans</i> α-vinyl-β-amino esters via asymmetric addition of siyl dienolate to sulfinylimines
AgBF4 catalyzed Mannich-type reactions of siyl dienolate with chiral aryl-substituted (S)-N-tert-butanesulfinylimines has been developed. A class of chiral trans α-vinyl-β-amino esters was obtained in moderate to excellent yields (up to 93%), good diastereoselectiveties (up to 92:8 dr), and complete α-site regioselectivity.</p
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