I-Catalyzed Oxidative Amidation of Benzylamines and Benzyl Cyanides under Mild Conditions.

We report a novel and efficient method for the oxidation of benzylic carbons (amines and cyanides) into corresponding benzamides using a catalytic amount of I and TBHP as the green oxidant via the C-H bond cleavage of the benzylic carbon under mild reaction conditions. According to the literature survey, this is the first report for the oxidative amidation of benzylamines and decyanation of benzyl cyanides in one pot under metal-free conditions.

Visible-light-promoted selective C-H amination of heteroarenes with heteroaromatic amines under metal-free conditions.

The regioselective C-H amination of quinoline amides (C5) and imidazopyridines (C3) under transition-metal-free conditions at room temperature with a high degree of functional group tolerance is reported. The C-H amination promoted by visible light in the presence of a photocatalyst with a wide range of heteroamines makes the present protocol more sustainable.

Catalyst-Free Synthesis of 2,4-Disubstituted-1-imidazoles through [3 + 2] Cyclization of Vinyl Azides with Amidines.

A facile and efficient route for the synthesis of 2,4-disubstituted imidazoles from benzimidamides and vinyl azides through [3 + 2] cyclization under catalyst-free conditions has been described. The method is compatible for a broad range of functional groups with good to excellent yields.

Copper-catalyzed aerobic oxidative amination of C(sp(3))-H bonds: synthesis of imidazo[1,5-a]pyridines.

Copper-catalyzed synthesis of imidazo[1,5-a]pyridine-1-carboxylates through oxidative amination of C(sp(3))-H bonds under mild aerobic conditions with broad substrate scope is described. Use of naturally abundant air as the sole oxidant was found to be efficient and selective. The present protocol is also applicable for direct synthesis of functionalized imidazo[1,5-a]pyridines from amino acid derivatives.

Copper-mediated synthesis of pyrazolo[1,5-a]pyridines through oxidative linkage of C-C/N-N bonds.

Copper-mediated synthesis of pyrazolo[1,5-a]pyridine-3-carboxylates through oxidative linkage of C-C and N-N bonds under mild reaction conditions is described. This protocol is applicable to a variety of pyridyl esters as well as various benzonitriles including nicotinonitrile, isonicotinonitrile and thiophene-2-carbonitrile. Better yields were observed with electron withdrawing substituted benzonitriles.

L-proline: an efficient catalyst for transamidation of carboxamides with amines.

In the presence of a catalytic amount of L-proline (10 mol %), transamidations of carboxamides with amines were achieved under solvent-free conditions. The transamidation process is compatible with a wide range of amines.

Synthesis of imidazo[1,2-a]pyridines: "water-mediated" hydroamination and silver-catalyzed aminooxygenation.

Aqueous syntheses of methylimidazo[1,2-a]pyridines without any deliberate addition of catalyst are reported. Imidazo[1,2-a]pyrazine and imidazo[2,1-a]isoquinoline were also obtained in good yields under similar conditions. With acetonitrile as solvent, Ag-catalyzed intramolecular aminooxygenation produced imidazo[1,2-a]pyridine-3-carbaldehydes in moderate to good yields.