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  • Title: Direct organocatalytic asymmetric aldol reaction of alpha-isothiocyanato imides to alpha-ketoesters under low ligand loading: a doubly stereocontrolled approach to cyclic thiocarbamates bearing chiral quaternary stereocenters.
    Author: Jiang X, Zhang G, Fu D, Cao Y, Shen F, Wang R.
    Journal: Org Lett; 2010 Apr 02; 12(7):1544-7. PubMed ID: 20205429.
    Abstract:
    The first doubly stereocontrolled organocatalytic asymmetric aldol reaction of alpha-isothiocyanato imides with alpha-ketoesters by using rosin-derived tertiary amine-thiourea under low ligand loading to form cyclic thiocarbamates bearing quaternary stereogenic centers with high levels of enantio- and diastereoselectivity (up to 99% ee, and 97:3 dr) is presented. This reaction provides a convenient doubly stereocontrolled method to access synthetic useful multiply substituted cyclic thiocarbamates with high optical purity.
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