A direct organocatalytic entry to sphingoids: asymmetric synthesis of d-arabino- and l-ribo-phytosphingosine
作者:Dieter Enders、Jiří Paleček、Christoph Grondal
DOI:10.1039/b515007h
日期:——
The organocatalytic asymmetric synthesis of D-arabino- and L-ribo-phytosphingosine is described employing a diastereo- and enantioselective (S)-proline-catalyzed aldolreaction of 2,2-dimethyl-1,3-dioxan-5-one and pentadecanal as the key step.
Asymmetric Synthesis of Jaspine B (Pachastrissamine) via an Organocatalytic Aldol Reaction as Key Step
作者:Dieter Enders、Violeta Terteryan、Jiří Paleček
DOI:10.1055/s-2008-1067142
日期:2008.7
The asymmetricsynthesis of jaspine B (pachastrissamine) using a (R)-proline-catalyzed enantioselective aldol reaction as keystep is described. Jaspine B was synthesized from the commercially available and inexpensive 1-pentadecanal and the dihydroxyacetone equivalent 2,2-dimethyl-1,3-dioxan-5-one in nine steps, good overall yield (23.6%) and excellent stereoselectivity (de >98%, ee = 95%).
描述了使用 (R)-脯氨酸催化的对映选择性醛醇反应作为关键步骤的 jaspine B (pachastrissamine) 的不对称合成。Jaspine B 由市售且廉价的 1-十五醛和二羟基丙酮等价物 2,2-二甲基-1,3-二恶烷-5-one 分九步合成,具有良好的总收率 (23.6%) 和出色的立体选择性(de > 98 %,ee = 95%)。
Asymmetric Synthesis of the α-d-Galactosyl Ceramide KRN7000 via an Organocatalytic Aldol Reaction as Key Step
作者:Dieter Enders、Violeta Terteryan、Jiří Paleček
DOI:10.1055/s-0029-1218844
日期:2010.9
The asymmetric synthesis of the antitumor and immunostimulatory α-d-galactosyl ceramideKRN7000 using a (R)-proline-catalyzed enantioselective aldol reaction as key step is described. The title compound is synthesized in thirteen linear steps with excellent stereoselectivity (de >98%, ee = 95%) employing the commercially available substrates 1-pentadecanal, 2,2-dimethyl-1,3-dioxan-5-one, hexacosanoic