Highly chemoselective synthesis of dimeric 2-oxindoles with a C-3/C-5′ linkage via Friedel–Crafts alkylations of 2-oxindoles with 3-hydroxy-2-oxindoles
Highly chemoselective synthesis of dimeric 2-oxindoles with a C-3/C-5′ linkage via Friedel–Crafts alkylations of 2-oxindoles with 3-hydroxy-2-oxindoles
Facile Creation of 3-Indolyl-3-hydroxy-2-oxindoles by an Organocatalytic Enantioselective Friedel-Crafts Reaction of Indoles with Isatins
作者:Jing Deng、Shilei Zhang、Peng Ding、Hualiang Jiang、Wei Wang、Jian Li
DOI:10.1002/adsc.200900851
日期:2010.3.22
The first direct enantioselectiveFriedel–Craftsreaction of indoles with isatins has been developed. The process is catalyzed by simple cupreine under mild reaction conditions and affords synthetically and biologically interesting, chiral 3‐indolyl‐3‐hydroxy‐2‐oxindoles in good yields (68–97%) and with high enantioselectivities (76–91%).
Asymmetric Addition of Indoles to Isatins Catalysed by Bifunctional Modified Cinchona Alkaloid Catalysts
作者:Pankaj Chauhan、Swapandeep Singh Chimni
DOI:10.1002/chem.201000846
日期:——
Simple and selective: An efficient organocatalyticenantioselective method for the synthesis of substituted‐3‐hydroxyoxindole derivatives with a quaternary chiral carbon has been developed. The cinchona alkaloid derived catalyst catalyses the Friedel–Crafts‐type addition of indole derivatives to the isatin derivatives under mild conditions to provide substituted 3‐hydroxyoxindoles in good to excellent
Highly chemoselective synthesis of dimeric 2-oxindoles with a C-3/C-5′ linkage via Friedel–Crafts alkylations of 2-oxindoles with 3-hydroxy-2-oxindoles
作者:K. Naresh Babu、Lakshmana K. Kinthada、Santanu Ghosh、Alakesh Bisai
DOI:10.1039/c5ob01670c
日期:——
An expeditious approach to a variety of dimeric 2-oxindoles with a C-3/C-5′ linkage sharing an all-carbon quaternary center at the pseudobenzylic position has been developed via Lewis acid-catalyzed F–C alkylations.