A General Strategy for the Practical Synthesis of Nojirimycin <i>C</i>-Glycosides and Analogues. Extension to the First Reported Example of an Iminosugar 1-Phosphonate
作者:Guillaume Godin、Philippe Compain、Géraldine Masson、Olivier R. Martin
DOI:10.1021/jo0203903
日期:2002.10.1
An efficient and versatile strategy for the synthesis of nojirimycin C-glycosides and related compounds with full stereocontrol is reported. The key steps of the process are the addition of organometallic reagents onto an L-sorbose-derived imine (13) followed by an internal reductive amination. The addition step, which controls the alpha- vs beta-configuration at the pseudoanomeric center in the final
报道了具有完全立体控制的合成诺奇霉素C-糖苷和相关化合物的有效且通用的策略。该方法的关键步骤是将有机金属试剂添加到L-山梨糖衍生的亚胺(13)上,然后进行内部还原胺化。控制最终产物中假异构体中心的α-与β-构型的加成步骤具有很高的非对映选择性(重新添加表面),并且可以通过添加外部单齿路易斯酸(si-face)有效地反转立体选择性。加成)。仅由市售的2,3; 4,6-二-O-异亚丙基-α-L-呋喃呋喃糖和提供的α-或β-1-C取代的1-deoxynojirimycin衍生物仅用10个步骤即可完成完整合成总产率为-52%。该策略已成功扩展到亚氨基1-膦酸酯的第一个实例。该方法提供了广泛的生物学相关的糖缀合物模拟物的途径,其中糖苷功能被亚氨基-C-糖苷键取代。