Aldol–Tishchenko Reaction of α-Oxy Ketones: Diastereoselective Synthesis of 1,2,3-Triol Derivatives
作者:Roberto Sanz、Carlos Sedano、Cintia Virumbrales、Samuel Suárez-Pantiga
DOI:10.1055/a-1509-5655
日期:2021.10
selectively deprotonated generating an enolate intermediate, which upon treatment with paraformaldehyde undergoes an aldol–Tishchenko reaction, leading to relevant 1,2,3-triol fragments in a totally diastereoselective manner. The excellent stereocontrol in the generation of a quaternary stereocenter is attributed to stereoelectronic effects in the Evans intermediate. This methodology allows overcoming some
α-氧酮很容易通过常规途径获得,可以选择性地去质子化产生烯醇中间体,在用多聚甲醛处理后发生羟醛-Tishchenko 反应,以完全非对映选择性的方式产生相关的 1,2,3-三醇片段。生成四元立体中心的出色立体控制归因于埃文斯中间体中的立体电子效应。这种方法可以克服我们之前报道的策略的一些限制,基于 α-锂硫苄基醚与酯和多聚甲醛的反应,拓宽了所获得多元醇的范围。该过程的合成应用包括制备新的 dilignol 模型和一些功能化的氧杂环丁烷。