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The choice is yours: A highly stereoselective synthesis of α‐alkyl‐α‐hydroxy‐β‐amino esters is accomplished through a tandem Wittig‐rearrangement/Mannich reaction sequence. Transformations of N‐benzyl or N‐Boc imines proceed with high selectivity for formation of syn‐amino alcohol derivatives, whereas N‐Boc‐2‐(phenylsulfonyl)amines generate anti‐amino alcohol products. Auxiliary cleavage (transesterification...
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