Use of a π-Complex of an Olefin as a Photochemical Catalyst

Visible-light-enabled denitrative carboxylation of β-nitrostyrenes: a direct photocatalytic approach to cinnamic acids

A novel, highly stereoselective synthesis of (E)-cinnamic acids from β-nitrostyrenes and CBr₄employing visible light photoredox catalysis has been developed.

Facile synthesis of 11-aryl-6H-isoindolo[2,1-a]indol-6-ones via hypervalent iodine(iii)-promoted cascade cyclization

An efficient method was developed for the synthesis of a tetracyclic fused indole and isoindoline ring system, under metal-free conditions.

Visible light photoredox catalysis: generation and addition of N-aryltetrahydroisoquinoline-derived α-amino radicals to Michael acceptors

The photoredox-catalyzed coupling of N-aryltetrahydroisoquinoline and Michael acceptors was achieved using Ru(bpy)(3)Cl(2) or [Ir(ppy)(2)(dtb-bpy)]PF(6) in combination with irradiation at 455 nm generated by a blue LED, demonstrating the trapping of visible light generated α-amino radicals. While intermolecular reactions lead to products formed by a conjugate addition, in intramolecular variants further dehydrogenation occurs, leading directly to 5,6-dihydroindolo[2,1-a]tetrahydroisoquinolines, which are relevant as potential immunosuppressive agents.

Synthesis of new cyclic thionosulfites

The reaction of a series of 1,2-diols with S(2)Cl(2), 1,1'-thiobisbenzimidazole (4a), and 1,1'-dithiobisbenzimidazole (4b) provides the corresponding thionosulfites, ROS(S)OR (2), in moderate to good yield.