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
Such chiral phosphine–internal olefin hybrid type ligands as N-1-adamantyl-N-cinnamylaniline derivatives 1 with C(aryl)–N(amine) bond axial chirality were synthesized and utilized for the palladium-catalyzed asymmetric allylicalkylation of indoles to afford the desired products in high enantioselectivities (up to 98% ee).
The preparation of various (R)-Sulfur-MOP ligands with aryl and alkyl substituents on sulfur, and the application of these ligands to Pd-catalyzed asymmetric allylic alkylation of indoles is reported. The sulfur substituent served as an effective stereocontrol element, and in the case of the 2-i-PrPh substituent on sulfur, the allylation products from an array of simple and substituted indoles were
The palladium-catalyzed asymmetric allylicalkylation of indoles with 1,3-diphenyl-2-propenyl acetate using P/N-type ligands such as N-aryl indole, C–N bond axially chiral aminophosphine (aS)-L4, gave the desired products 1 in good yields and with moderate to high enantioselectivities (up to 90% ee).
We synthesized cinnamoyl amide type chiral P,olefin ligand (S)-4. We successfully obtained separable diastereomers of 4d and demonstrated Pd-catalyzed asymmetric allylic substitution reactions of indoles using (S,aS)-4d as a chiral ligand with high enantioselectivities (up to 98% ee).
我们合成了肉桂酰胺型手性P,烯烃配体( S ) -4。我们成功地获得了4d的可分离非对映异构体,并证明了使用 ( S , aS ) -4d作为具有高对映选择性(高达 98% ee)的手性配体的Pd 催化的吲哚不对称烯丙基取代反应。