Radical scavenging by N-aminoazaaromatics

Facile synthesis of 1-aminoindoles via Rh(iii)-catalysed intramolecular three-component annulation

A simple and efficient procedure to 1-aminoindoles starting from easily available aryl hydrazines, diazo compounds and ketones via a rhodium-catalyzed [3 + 2] annulative coupling reaction.

Synthesis of di-, tri- and tetracyclopropylhydrazines

Previously unknown 1,1-dicyclopropylhydrazine was obtained in two steps starting from dicyclopropylamine. It serves as a convenient starting material to tri- and tetracyclopropylhydrazines, which have not been described in the literature either. Tricyclopropylhydrazine was prepared in an overall four-step sequence featuring the de Meijere-Chaplinski modification of the Kulinkovich reaction as a key step. Tetracyclopropylhydrazine was obtained by the reductive amination of the cyclopropanone ethyl trimethylsilyl acetal with 1,1-dicyclopropylhydrazine or with the parent hydrazine. Synthetic utility of these cyclopropylhydrazine building blocks is presented as well.

Iridium(iii)- and rhodium(iii)-catalyzed coupling of anilines with α-diazoesters via chelation-assisted C–H activation

Ir(iii) catalysts can catalyze the efficient synthesis of indoles via C–H activation of anilines in the coupling with α-diazo β-ketoesters.

Rh(iii)-catalyzed redox-neutral annulation of azo and diazo compounds: one-step access to cinnolines

Cinnolines were synthesized in one step from azo and diazo compounds via a Rh(iii)-catalyzed redox-neutral C–H activation and C–N bond formation strategy.

Visible light C-H amidation of heteroarenes with benzoyl azides

Benzoyl azides were used for the direct and atom economic C-H amidation of electron rich heteroarenes in the presence of phosphoric acid, a photocatalyst and visible light. Hetero-aromatic amides are obtained in good yields at very mild reaction conditions with dinitrogen as the only by-product. The reaction allows the use of aryl-, heteroaryl- or alkenyl acyl azides and has a wide scope for heteroarenes, including pyrroles, indole, furan, benzofuran and thiophene giving good regio-selectivities and yields.

Rhodium(III)-catalyzed cyclative capture approach to diverse 1-aminoindoline derivatives at room temperature

A Rh(III) -catalyzed C-H activation/cyclative capture approach, involving a nucleophilic addition of C(sp(3) )-Rh species to polarized double bonds is reported. This constitutes the first intermolecular catalytic method to directly access 1-aminoindolines with a broad substituent scope under mild conditions.

Rh(iii)-catalyzed synthesis of 1-aminoindole derivatives from 2-acetyl-1-arylhydrazines and diazo compounds in water

Rh(iii)-catalyzed synthesis of 1-aminoindole derivatives from 2-acetyl-1-arylhydrazines and diazo compounds has been developed, through tandem C–H activation, cyclization and condensation.