N-Heterocyclic Carbene-Catalyzed Reaction of Alkynyl Aldehydes with 1,3-Keto Esters or 1,3-Diketones
作者:Zhi-Qiang Zhu、Ji-Chang Xiao
DOI:10.1002/adsc.201000240
日期:2010.10.4
The N-heterocyclic carbene-catalyzed reaction of alkynyl aldehydes with 1,3-keto esters or 1,3-diketones has been studied. This protocol offers an entirely new, mild and atom-economical access to highly functionalized 3,4-dihydropyranones.
aerobic asymmetric cyclization reaction of cinnamaldehydes and 1,3-dicarbonylcompounds through oxidative NHC-catalysis has been developed, and it allows the synthesis of a wide range of enantiomeric enriched dihydropyranone derivatives in good yields with good to excellent enantioselectivities. Various α,β-unsaturated aldehydes with aliphatic and aromatic substitution groups and 1,3-dicarbonyl compounds