Chemoenzymic Synthesis of D-erythro- and L-threo-C18-Sphingosines
作者:Tomas Hudlicky、Thomas Nugent、William Griffith
DOI:10.1021/jo00105a002
日期:1994.12
Biocatalytic conversion of chlorobenzene to the corresponding homochiral cyclohexadiene cis-diol allows, through careful symmetry-based planning, the stereodivergent synthesis of two sphingosine stereoisomers, the natural isomer 1 and the L-threo isomer 2, from selectively prepared diastereomers of azido alcohol 5.
Chemoenzymatic Synthesis of All Four Stereoisomers of Sphingosine from Chlorobenzene: Glycosphingolipid Precursors<sup>1</sup><sup>a</sup>
作者:Thomas C. Nugent、Tomas Hudlicky
DOI:10.1021/jo971335a
日期:1998.2.1
enabled the synthesis of all four enantiomerically pure C(18)-sphingosines 1. The four requisite diastereomers of azido alcohols 4a-d were accessed by regioselective opening of epoxides 7 and 8 with either azide or halide ions. The configuration of C4 and C5 in azides 4 defines the stereochemistry of the incipient sphingosine chain, liberated from 4 by the oxidative cleavage of the C1-C6 olefin. For L-threo-sphingosine