Catalytic Asymmetric Formal C–C Bond Insertion Reaction of Aldehydes via 1,2-Acyl Shift: Construction of All-Carbon Quaternary Stereocenters with Three Carbonyl Groups
作者:Hye-Min Jeong、Jin Won Lee、Dong Kyu Kim、Do Hyun Ryu
DOI:10.1021/acscatal.3c04726
日期:2024.1.5
The formal C–H bond insertionreaction into aldehydes via 1,2-hydride shift has been well established; however, the formal C–C bond insertion is more challenging. In the presence of chiral oxazaborolidinium ion (COBI) catalyst, the formal C–C bond insertion into glyoxals was developed via an 1,2-acyl shift for the construction of α-alkyl-α-formyl-β-ketoesters in high yield (up to 97%) with high enantioselectivity
Iron-Catalyzed Asymmetric Epoxidation of β,β-Disubstituted Enones
作者:Yasuhiro Nishikawa、Hisashi Yamamoto
DOI:10.1021/ja201873d
日期:2011.6.8
The combination of Fe(OTf2) and novel phenanthroline ligands enables the catalytic asymmetric epwddation of acyclic beta,beta-disubstituted enones, which have been a heretofore inaccessible substrate class. The reaction provides highly enantioenriched alpha,beta-epoxyketones (up to 92% ee) that can be further converted to functionalized beta-ketoaldehydes with an all-carbon quaternary center.
BACH, R. D.;DOMAGALA, J. M., J. ORG. CHEM., 1984, 49, N 22, 4181-4188