Organocatalytic Sequential One-Pot Double Cascade Asymmetric Synthesis of Wieland−Miescher Ketone Analogues from a Knoevenagel/Hydrogenation/Robinson Annulation Sequence: Scope and Applications of Organocatalytic Biomimetic Reductions
作者:Dhevalapally B. Ramachary、Mamillapalli Kishor
DOI:10.1021/jo070277i
日期:2007.7.1
practical and novel organocatalytic chemo- and enantioselective process for the cascade synthesis of highly substituted 2-alkyl-cyclohexane-1,3-diones and Wieland−Miescher (W−M) ketone analogs is presented via reductive alkylation as a key step. First time, we developed the one-step alkylation of dimedone and 1,3-cyclohexanedione with aldehydes and Hantzsch ester through an organocatalytic reductive alkylation
通过还原烷基化,提出了一种实用且新颖的有机催化化学和对映选择性工艺,用于级联合成高度取代的2-烷基-环己烷-1,3-二酮和Wieland-Miescher(WM)酮类似物,这是关键步骤。首次,我们通过有机催化还原烷基化策略开发了二醛和1,3-环己二酮与醛和Hantzsch酯的一步烷基化。l的直接组合CH酸(二甲酮和1,3-环己烷二酮),醛,汉茨sch酯和甲基乙烯基酮的脯氨酸催化的级联Knoevenagel /加氢和级联的Robinson环氧化反应提供了高官能度的W-M酮类似物,并具有良好的收率。优异的对映选择性。许多还原性烷基化产物直接显示在药物化学中。