General and Efficient Syntheses of C<sub>18</sub>-4,8-Sphingadienines via S<sub>N</sub>2‘-Type Homoallylic Coupling Reactions Mediated by Thioether-Stabilized Copper Reagents
作者:Xiang-Zhu Wang、Yu-Lin Wu、Shende Jiang、Gurdial Singh
DOI:10.1021/jo005602f
日期:2000.12.1
The stereoselective syntheses of C(18)-4,8-sphingadienines 3 and 4 as analogues of sphingosine 1 are described. The key step in these syntheses involved a novel S(N)2'-type homoallylic coupling reaction between the corresponding thioether-stabilized allylic copper reagents and the allylic mesylate 7. The thioether-stabilized allylic copper reagents were easily prepared and retained the configuration
描述了作为鞘氨醇1类似物的C(18)-4,8-鞘氨二烯3和4的立体选择性合成。这些合成中的关键步骤涉及相应的硫醚稳定的烯丙基铜试剂和甲磺酸甲磺酸酯7之间的新型S(N)2'型均烯丙基偶联反应。硫醚稳定的烯丙基铜试剂易于制备并保留了它们在偶联反应中的双键,因此克服了异构化的问题,该问题通常与在这种应用中使用烯丙基有机金属试剂有关。