Effective, High-Yielding, and Stereospecific Total Synthesis of <scp>d</scp>-<i>e</i><i>rythro</i>-(2<i>R</i>,3<i>S</i>)-Sphingosine from <scp>d</scp>-<i>r</i><i>ibo</i>-(2<i>S</i>,3<i>S</i>,4<i>R</i>)-Phytosphingosine
作者:Richard J. B. H. N. van den Berg、Cornelius G. N. Korevaar、Herman S. Overkleeft、Gijsbert A. van der Marel、Jacques H. van Boom
DOI:10.1021/jo049277y
日期:2004.8.1
The synthesis of naturally occurring d-erythro-(2R,3S,4E)-sphingosine from commercially available d-ribo-(2S,3S,4R)-phytosphingosine is described. The key step in the reaction sequence comprises TMSI/DBN promoted regio- and stereoselective oxirane opening of intermediate 2-phenyl-4-(S)-[(1S,2S)-1,2-epoxyhexadecyl]-1,3-oxazoline followed by the in situ trans-elimination of 2-phenyl-4-(S)-[(1S,2R)-1