designed fluorene-based mono- and bimetallic Pd–PEPPSI complexes were synthesized and demonstrated to be effective for the one-pot sequential α-arylation/alkylation of oxindoles. This streamlined approach offers efficient access to functionalized 3,3-disubstitutedoxindoles in excellent yields (up to 89%) under mild reaction conditions.
Direct Allylic C–H Bond Activation To Synthesize [Pd(η<sup>3</sup>-cin)(IPr)Cl] Complex: Application in the Allylation of Oxindoles
作者:Rong-Bin Hu、Chun-Hai Wang、Wei Ren、Zhong Liu、Shang-Dong Yang
DOI:10.1021/acscatal.7b02965
日期:2017.11.3
an efficient ligand in promoting allylic C–Hbond functionlizations. Notably, the catalytic [Pd(η3-cin)(IPr)Cl] complex (where cin = cinnamyl) was formed in situ from direct C–Hactivation of allylic precursors, and was obtained by way of one-pot strategy with available IPr·HCl and allylbenzene. The catalyst exhibits high regioselectivity and stereoselectivity of the allylic C–H alkylation with oxindoles
Transition-Metal-Free Alkynylation of 2-Oxindoles through Radical–Radical Coupling
作者:Hong-Yan Huang、Liang Cheng、Jie-Jie Liu、Dong Wang、Li Liu、Chao-Jun Li
DOI:10.1021/acs.joc.6b03057
日期:2017.3.3
An effective transition-metal-free approach for the synthesis of 3-alkynyl-2-oxindoles through a radical–radical coupling process was developed. The reaction was general with respect to 2-oxindoles and iodoalkynes and provided the desired products bearing a quaternary center at C3 in good to excellent yields, making this method synthetically viable and attractive for the synthesis of spiro and fused
A Palladium-Catalyzed α-Arylation of Oxindoles with Aryl Tosylates
作者:Jindian Duan、Fuk Yee Kwong
DOI:10.1021/acs.joc.7b00855
日期:2017.6.16
A palladium-catalyzed monoselective C3 arylation of 2-oxindoles with aryl tosylates is described. With the Pd/CM-phos catalyst system, the corresponding 3-arylated oxindoles can be obtained in good to excellent yields (≤97%). The reaction conditions are mild (using 0.5 mol % Pd in general and KF as a base), and functional groups such as methyl ester, NH amido, and enolizable keto moieties are found