Enantioselective Construction of Polycyclic Chromanes through Organocatalytic Sequential Quintuple Reaction via One‐Pot Step‐Wise Procedure
作者:Jie Wang、Hang Qin、Ya‐Li Song、Fei Cao、Zhi‐Hao You
DOI:10.1002/cjoc.202400328
日期:2024.9.15
An efficient and highly stereoselective synthetic method to access polycyclic chromanes has been achieved through organocatalyzed one-pot step-wise reactions involving 2-hydroxycinnamaldehydes, 2-aminochalcones, and malononitrile as substrates. The reactions underwent a quintuple process by aza-Michael/Michael/Knoevenagel/oxa-Michael/aldol-type reaction in sequence to give products bearing 3 new generated
An Efficient Carbene-Catalyzed Access to 3,4-Dihydrocoumarins
作者:Kirsten Zeitler、Christopher A. Rose
DOI:10.1021/jo802285r
日期:2009.2.20
Dihydrocoumarins play an important role as flavor and fragrance compounds and can be prepared efficiently from o-hydroxycinnamaldehydes in a mild, atom-economic N-heterocyclic carbene-catalyzed redox lactonization. Corresponding coumarins are accessible via a one-pot domino oxidation lactonization procedure in the presence of oxidants.