Reduction of activated carbonyl groups by alkyl phosphines: formation of α-hydroxy esters and ketones
作者:Wen Zhang、Min Shi
DOI:10.1039/b516467b
日期:——
Reduction of activated carbonyl groups such as alpha-keto esters, benzils, 1,2-cyclohexanedione, and alpha-ketophosphonates by alkyl phosphines afforded the corresponding alpha-hydroxy esters or ketones in good to excellent yields in THF at room temperature. The mechanism of the proton transfer and intramolecular hydrolysis has been studied on the basis of deuterium and 18O labeling experiments.
Chiral N-heterocyclic carbene ligands for asymmetric catalytic oxindole synthesis
作者:Yi-Xia Jia、J. Mikael Hillgren、Emma L. Watson、Stephen P. Marsden、E. Peter Kündig
DOI:10.1039/b810858g
日期:——
The Pd-catalysed asymmetric intramolecular alpha-arylation of amide enolates containing heteroatom substituents gives chiral 3-alkoxy or 3-aminooxindoles in high yield and with enantioselectivities up to 97% ee when a new chiralN-heterocycliccarbeneligand is used.