enantioselective allylicamination of acyclic allylic carbonates catalyzed by a palladium/(S)-BINAP(S) system was investigated. Amination of several substrates proceeded with high ee. Crotyl carbonates show an unusually high regioselectivity for the branched isomer. The use of (S)-TolBINAP(S) and (S)-3,5-xylyl-BINAP(S) as ligands was found to increase the enantioselectivity of the aminations. A P,S binding
Amphiphilic π-Allyliridium <i>C</i>,<i>O</i>-Benzoates Enable Regio- and Enantioselective Amination of Branched Allylic Acetates Bearing Linear Alkyl Groups
作者:Arismel Tena Meza、Thomas Wurm、Lewis Smith、Seung Wook Kim、Jason R. Zbieg、Craig E. Stivala、Michael J. Krische
DOI:10.1021/jacs.7b13482
日期:2018.1.31
amphiphilic reactivity in the context of enantioselective catalysis are described. Commercially available π-allyliridium C,O-benzoates, which are stable to air, water and SiO2 chromatography, and are well-known to catalyze allyl acetate-mediated carbonyl allylation, are now shown to catalyze highly chemo-, regio- and enantioselective substitutions of branched allylicacetates bearing linear alkyl groups with
Asymmetric allylic amination catalyzed by chiral ferrocenylphosphine-palladium complexes
作者:Tamio Hayashi、Kohei Kishi、Akihiro Yamamoto、Yoshihiko Ito
DOI:10.1016/s0040-4039(00)88870-x
日期:1990.1
A palladiumcomplex bearing chiral (hydroxyalkyl)ferrocenylphosphine ligand was found to be a highly regio-and stereoselective catalyst for the asymmetric allylic amination of 2-butenyl acetates with benzylamine, the nucleophilicattack of the amine taking place selectively on the more substituted end of the π-allylpalladium intermediate to give optically active 3-benzyamino- 1-butene of up to 84%