已开发出一种适用于Knoevenagel化学的新的级联途径,该途径涉及1,3-二羰基体系与α,β,γ,δ-不饱和醛之间的偶联。该过程包括经典的醛醇缩合和罕见的无自发的无金属环异构化的组合,代表了环戊并[ b ]呋喃型衍生物的立体选择性合成的融合和创新方法。研究了反应伙伴和机理特征的范围和局限性。有意义的是,我们的研究为控制共轭多烯羰基体系反应性的结构和电子效应提供了有价值的指导。
Biomimetic Domino Knoevenagel/Cycloisomerization Strategy for the Synthesis of Citridone A and Derivatives
作者:Aabid H. Bhat、Gastón N. Quiroga、Agustina La-Venia、Huck K. Grover、Martín J. Riveira
DOI:10.1021/acs.joc.1c01542
日期:2021.9.3
between conjugated dienals and 4-hydroxy-2-pyridone/quinolone-type 1,3-dicarbonyl equivalents led to the development of a simple one-pot strategy to access citridone A and related synthetic cyclopenta[b]furopyridones/quinolones. The present work highlights the power of domino cascades in the synthesis of natural product frameworks and may help promote future studies on this promising new class of pyridone
对共轭二烯醛和 4-羟基-2-吡啶酮/喹诺酮型 1,3-二羰基等价物之间的 Knoevenagel 缩合的研究导致开发了一种简单的一锅策略来获得citridone A 和相关的合成环戊二烯[ b ]呋喃吡啶酮/喹诺酮. 目前的工作突出了多米诺级联在天然产物框架合成中的作用,并可能有助于促进对这种有前途的新型吡啶酮生物碱的未来研究。
Iodine-Catalyzed Iso-Nazarov Cyclization of Conjugated Dienals for the Synthesis of 2-Cyclopentenones
作者:Lucía A. Marsili、Jorgelina L. Pergomet、Vincent Gandon、Martín J. Riveira
DOI:10.1021/acs.orglett.8b03229
日期:2018.11.16
Molecular iodine was identified as an efficient catalyst for the cycloisomerization of conjugated dienals to substituted 2-cyclopentenones. DFT calculations suggested an unexpected concerted character for this cyclization.