Catalytic Asymmetric Allylic Amination with Isatins, Sulfonamides, Imides, Amines, and <i>N</i>-Heterocycles
作者:Ciarán C. Lynch、Kaluvu Balaraman、Christian Wolf
DOI:10.1021/acs.orglett.0c00936
日期:2020.4.17
A generally useful palladium-catalyzed method for the asymmetricallylicamination with a large variety of isatins, sulfonamides, imides, amines, and N-heterocycles is introduced. A single protocol with a readily available catalyst accomplishes this reaction at room temperature with high yields and enantioselectivities often exceeding 90%, which is demonstrated with 31 examples.
New Schiff bases derived from chiral d‐camphor were determined to be effective phosphine ligands for the asymmetric palladium‐catalyzed allylic alkylation of activated methylene compounds, the allylic etherification of alcohols, and the allylic amination of primary amines or secondary amines, in which the corresponding products with various functional groups were achieved in good yields with excellent
Palladium-Catalyzed Enantioselective Allylic Substitution in the Presence of Monodentate Furanoside Phosphoramidites
作者:Maciej Majdecki、Janusz Jurczak、Tomasz Bauer
DOI:10.1002/cctc.201402933
日期:2015.3
D‐xylose and optically pure 1,1′‐bi‐2‐naphthol (BINOL), was used as ligands for the palladium‐catalyzed allylic alkylation and amination. The matched pair was formed from D‐xylose‐derivatives and (S)‐BINOL. The asymmetricinduction depends strongly on the substituent at the C5 of the carbohydrate backbone; both bulky 5‐O‐pivaloyl and 5‐deoxy derivatives gave excellent results, whereas ligands with trityl
Asymmetricallylicsubstitutionreactions between 1,3-diphenyl-2-propenyl acetate and various hetero nucleophiles were efficiently carried out using the catalysts derived from the monodentatephosphine ligands, (1R, 2S, 5R, 6S)-2,6-dimethyl-9-phenyl-9-phosphabicyclo[3.3.1] nonane and its enantiomer ((−)- and (+)-9-PBNs), and palladium (0).