Gold(I)-Catalyzed, Stereocontrolled Enamide Synthesis from Primary Amides and Propargyl Aldehydes Using a Tandem Strategy
作者:Sang Min Kim、Dabon Lee、Soon Hyeok Hong
DOI:10.1021/ol503055x
日期:2014.12.5
A novel strategy for enamide synthesis from primary amides and propargyl aldehydes via Au(I)-catalyzedtandem amide addition and Meyer–Schuster rearrangement is described. In situ generated hemiaminals were successfully converted to the desired products under the optimized conditions. Enamide stereochemistry was controlled simply by changing solvents and adding a catalytic amount of acid. The developed
Asymmetric Protonation of Cumulenolates: Synthesis of Allenyl Aldehydes Facilitated by an Organomanganese Auxiliary
作者:Animesh Roy、Bilal A. Bhat、Salvatore D. Lepore
DOI:10.1021/acs.orglett.5b03681
日期:2016.3.18
Chiral ammonium salts were used to catalyze the isomerization of organomanganese-complexed alkynyl aldehydes to chiral allenal building blocks in moderate to good enantiomericexcesses. Normally, conjugated alkynyl aldehydes do not isomerize to their thermodynamically less stable allene isomers. However, with a manganese auxiliary in place to promote allene formation, asymmetric protonation of cumulenolate