Enantioselective Syntheses of<i>xylo</i>-C<sub>18</sub>-Phytosphingosines using Double Stereodifferentiation
作者:Pradeep Kumar、Rodney A. Fernandes
DOI:10.1055/s-2003-36261
日期:——
The concept of double stereodifferentiation in Sharpless asymmetric dihydroxylation has been studied and the results obtained are applied to the diastereoselective syntheses of xylo-isomers of C18-phytosphingosine. The diastereomeric mixture obtained could be separated by column chromatography. Thus, the l-xylo-(2R,3S,4S)-C18- and d-xylo-(2S,3R,4R)-C18-phytosphingosines as their tetraacetate derivatives were synthesized in diastereomerically pure form.
研究了 Sharpless 不对称二羟基化过程中的双立体异构概念,并将所得结果应用于非对映选择性合成 C18-phytosphingosine 的 xylo 异构体。所获得的非对映异构体混合物可通过柱层析法进行分离。因此,以非对映纯形式合成了 l-xylo-(2R,3S,4S)-C18- 和 d-xylo-(2S,3R,4R)-C18-phytosphingosine 作为它们的四乙酸酯衍生物。