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
N1-Functionalized Indole-Phosphane Oxazoline (IndPHOX) Ligands in Asymmetric Allylic Substitution Reactions
作者:Yu Wang、Matti J. P. Vaismaa、Kari Rissanen、Robert Franzén
DOI:10.1002/ejoc.201101540
日期:2012.3
IndPHOX ligands bearing various groups have been synthesized and the effects of the N1-substituent on the reaction rate, yield, and asymmetricinduction in a palladium-catalyzedallylicsubstitutionreaction are reported. The presence of an oxygen atom in the ligands, namely an N-MOM or N-THP group, led to enhancement of the enantioselectivity in the allylic amination reaction. In addition, a ligand with
New spiro phosphinooxazolines for palladium-catalyzed asymmetric allylic amination
作者:Yanfeng Gao、Zhongxuan Qiu、Rui Sun、Nanxing Gao、Guorui Cao、Dawei Teng
DOI:10.1016/j.tetlet.2018.09.044
日期:2018.10
The new conformational rigid spiro phosphinooxazolines 1 were synthesized from 7-bromo-1-indanone. The asymmetric catalytic potential of them was demonstrated in the asymmetric palladium catalyzed allylicamination. High yields and enantioselectivities were obtained with alkylamines.
Pd-catalyzed asymmetric allylic etherification and amination with a wide range of O- and N-nucleophiles using a chiral sulfoxide–phosphine ligand have been developed (up to 97% yield, 98.5% ee).
P,Nsp3-bidentate chiral ligands bearing spiro[indane-1,2′-pyrrolidine] backbone were prepared in gram scale for the first time. Pd complexes of these air-stable amino phosphine ligands could catalyze asymmetric allylic substitutions of malonate-, alcohol-, and amine-type nucleophiles in up to 97% ee and 99% yield. A crystal structure of [Pd(II)(η3-1,3-diphenylallyl)(ligand)]PF6 indicated possible transition