Stereocontrolled Route to Vicinal Diamines by [3.3] Sigmatropic Rearrangement of Allyl Cyanate: Asymmetric Synthesis of <i>anti</i>-(2<i>R</i>,3<i>R</i>)- and <i>syn-</i>(2<i>R</i>,3<i>S</i>)-2,3-Diaminobutanoic Acids
consecutive steps: stereoselective construction of allyl anti- and syn-1,2-diols followed by [1,3]-chirality transfer by sigmatropic rearrangement, which allow an access to anti-(2R,3R)- and syn-(2R,3S)-2,3-diaminobutanoic acids. [reaction: see text]