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
Spiro Indane-Based Phosphine-Oxazolines as Highly Efficient P,N Ligands for Enantioselective Pd-Catalyzed Allylic Alkylation of Indoles and Allylic Etherification
作者:Zhongxuan Qiu、Rui Sun、Kun Yang、Dawei Teng
DOI:10.3390/molecules24081575
日期:——
were examined for palladium-catalyzedasymmetricallylic alkylation of indoles. Under optimized conditions, high yields (up to 98%) and enantioselectivities (up to 98% ee) were obtained with a broad scope of indole derivatives. The ligand was determined to be the most efficient P,N-ligand for this reaction. Moreover, the ligand was also efficient for Pd-catalyzed asymmetricallylic etherification with
Chiral Imidazoline–Phosphine Ligands for Palladium-Catalyzed Asymmetric Allylic Substitutions
作者:Liang-yong Mei、Zhi-liang Yuan、Min Shi
DOI:10.1021/om2008309
日期:2011.12.12
to 96% ee), and chiral ligand L9 can be used for the palladium-catalyzedasymmetric allylic monofluoromethylation of 1,3-diphenylpropenyl acetate with 1-fluorobis(phenylsulfonyl)methane to afford the corresponding product in excellent enantioselectivities (up to 98% ee) and moderate yields under mild conditions. The bidentate N,P-coordination pattern to the Pd atom with ligand L1 has been unambiguously
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