Asymmetric Michael addition between kojic acid derivatives and unsaturated ketoesters promoted by <i>C</i><sub>2</sub>-symmetric organocatalysts
作者:Alexey A. Kostenko、Alexander S. Kucherenko、Andrey N. Komogortsev、Boris V. Lichitsky、Sergei G. Zlotin
DOI:10.1039/c8ob02523a
日期:——
An efficient sterically hindered C2-symmetric bifunctionaltertiary amine–squaramide organocatalyst for the asymmetric Michaeladdition/hemiketalization domino reaction of kojic acid derivatives with β,γ-unsaturated α-ketoesters has been designed. Pharmacology-relevant functionalized 2,3,4,8-tetrahydropyrano[3,2-b]pyran derivatives were produced over the catalyst in as low as 1 mol% with up to 99%
设计了一种高效的位阻C 2对称双官能叔胺-方酰胺有机催化剂,用于曲酸衍生物与β,γ-不饱和α-酮酸酯的不对称迈克尔加成/半缩酮化多米诺反应。在催化剂上以低至1 mol%的产率制备了药理学相关的官能化2,3,4,8-四氢吡喃并[3,2- b ]吡喃衍生物,产率高达99%,ee高达99%。该程序至少可扩展30倍,并且该催化剂可通过酸碱萃取容易地用于催化反应中。用(S)-或rac酰化产物-布洛芬和十一碳烯酸与相应的手性酯含有两个特权药效基序。
Organocatalytic Asymmetric Double Addition of Kojic Acids to 2‐Nitroallylic Carbonates
作者:Ruslan A. Kovalevsky、Maxim V. Smirnov、Alexander S. Kucherenko、Kseniya A. Bykova、Elizaveta V. Shikina、Sergei G. Zlotin
DOI:10.1002/ejoc.202101435
日期:2022.1.21
Chiral nitrocompounds containing two hydroxypyranone units were enantioselectively produced from kojic acid derivatives and 2-nitroallylic carbonates in the presence of bifunctional tertiary amine-squaramide organocatalyst. The reaction products were converted to corresponding acetates and nitro glutarates via acylation or oxidative fragmentation reactions.