Palladium-Catalyzed Synthesis of 2-Fluoroalkyl-3-methylene-3H-indoles Through a Domino Carbopalladation/CH Activation Process

Pd-Catalyzed Deacylative [4 + 1] Annulation of N-Arylimidoyl Chlorides with β-Keto Esters Leading to 2-Fluoroalkyl Indoles

A palladium-catalyzed [4 + 1] annulation of N-arylimidoyl chlorides with β-keto esters has been developed. In the presence of Pd(OAc)2, PCy3, and K3PO4, a variety of fluoalkyl-containing N-arylimidoyl chlorides smoothly underwent the cascade C-H imidoylation/deacylative Heck-type reactions to afford biologically important 2-fluoroalkyl indoles in moderate to good yields.

Pd-Catalyzed Vicinal Intermolecular Annulations of Iodoarenes, Indoles, and Carbazoles with Enynes

Reaching the formidable C-H corners has been one of the top priorities of organic chemists in the recent past. This prompted us to disclose herein a vicinal annulation of 2-iodo benzoates, indoles, and carbazoles with N-embedded 1,6-enynes through 7-/8-membered palladacycles. The relay does not require the assistance of any directing group, leading to multicyclic scaffolds, which are readily diversified to an array of adducts (with new functional tethers and/or three contiguous stereocenters), in which we showcase a rare benzylic mono-oxygenation.

Organocatalytic regio-, diastereo- and enantioselective γ-additions of isoxazol-5(4H)-ones to β,γ-alkynyl-α-imino esters for the synthesis of axially chiral tetrasubstituted α-amino allenoates

The chiral phosphoric acid catalyzed regio-, diastereo- and enantioselective reaction of isoxazol-5(4H)-ones with β,γ-alkynyl-α-imino esters has been developed.

2-(Trifluoromethyl)indoles via Pd(0)-Catalyzed C(sp(3))-H Functionalization of Trifluoroacetimidoyl Chlorides

Perfluoroalkylated indoles are valuable compounds in drug discovery. A Pd(0)-catalyzed C(sp(3))-H functionalization enables access to 2-(trifluoromethyl)indoles from trifluoroacetimidoyl chlorides. These are stable compounds, easily obtained from anilines. The cyclization operates with catalyst loadings as low as 1 mol % and accommodates a variety of substituents.

Radical perfluoroalkylation – easy access to 2-perfluoroalkylindol-3-imines via electron catalysis

Arylisonitriles react with alkyl and perfluoroalkyl radicals to form 2-alkylated indole-3-iminesviatwo sequential additions to the isonitrile moiety followed by homolytic aromatic substitution.

Synthesis of 2-trifluoromethyl indoles via visible-light induced intramolecular radical cyclization

A visible-light induced intramolecular radical cyclization is described. The reaction allows the rapid construction of 2-trifluoromethyl-3-acylindoles in a sequential C–C and C–O bond formation process under mild conditions.

Synthesis of fluorine-containing multisubstituted phenanthridines by rhodium-catalyzed alkyne [2+2+2] cycloaddition and tandem sp² C-H difluoromethylenation

A highly efficient method for the synthesis of fluorine-containing multisubstituted phenanthridines through Rh-catalyzed alkyne [2+2+2] cycloaddition reactions has been developed. This method exhibits excellent functional-group compatibility. When a bromodifluoromethyl group, rather than a trifluoromethyl group, was employed in the cycloaddition reaction, more-complicated polycyclic compounds were obtained through tandem Rh-catalyzed cycloaddition/C-H difluoromethylenation. This route provides convenient access to fluorine-containing polycyclic compounds.