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
的天然存在的合成d -赤- (2 - [R,3 S, 4 ë)-sphingosine由市售d -核糖- (2小号,3小号,4 - [R)-phytosphingosine进行说明。反应顺序中的关键步骤包括TMSI / DBN促进中间体2-苯基-4-(S)-[(1 S,2 S)-1,2-环氧十六烷基] -1,3-的区域和立体选择性环氧乙烷开口恶唑啉,然后原位反清除2-苯基-4-(S)-[(1 S,2 R)-1,2-二脱氧-2-碘-1-三甲基甲硅烷基氧十六烷基] -1,3-恶唑啉。