Carbene-Mediated Quaternarization of the Anomeric Position of Carbohydrates: Synthesis of Allylic Ketopyranosides, Access to the Missing α-Gluco and β-Manno Stereoisomers, and Preparation of Quaternary 2-Deoxy 2-Acetamido Sugars
作者:Kévin Mébarki、Marine Gavel、Floriane Heis、Antoine Yvan Philippe Joosten、Thomas Lecourt
DOI:10.1021/acs.joc.7b01493
日期:2017.9.1
Following our work on the C–H functionalization of carbohydrates by the 1,5 insertion of metal–carbenes, we report herein the robust and scalable conversion of sugar γ-lactones into highly valuable glycosides having a quaternary anomeric position substituted by an allyl chain ready for further functionalization. A divergent synthetic approach furthermore provided a straightforward access to ketopyranosides
继我们通过1,5插入金属碳烯对碳水化合物的C–H官能化工作之后,我们在此报告了糖γ-内酯的稳健且可扩展的转化为高度有价值的糖苷,其具有季戊烷位置已被烯丙基链取代进行进一步的功能化。此外,采用不同的合成方法可直接获得在位置2具有较大化学和立体多样性的酮吡喃糖苷。