Palladium-catalyzed synthesis of 3-alkenyl indoles from 2-azido-3-arylacrylates and terminal alkenes at room temperature

Vinylazides: versatile synthons and magical precursors for the construction of N-heterocycles

Nowadays, application of vinylazides as precursors is a key method for the construction of N-heterocycles in organic synthesis. These versatile three-atom synthons can be converted into intermediates such as 2H-azirines, iminyl radicals, iminyl metal complexes, iminyl inions and nitrilium ions that subsequently afford a wide range of polyfunctional cyclic nitrogen-containing compounds. In this review, the reactions of vinylazides leading to these products (in the last decade) are categorized based on the types of the resulting N-heterocyclic rings and a brief and concise description of the reaction mechanisms is presented.

Synthesis of polysubstituted 4-aminopyrazoles and 4-hydroxypyrazoles from vinyl azides and hydrazines

A simple and direct synthesis of polysubstituted 4-aminopyrazoles and 4-hydroxypyrazoles from vinyl azides and hydrazines.

ZrCl4-promoted facile synthesis of indole derivatives

Zirconium(iv) chloride effectively activates nitrogen (N₂) extrusion from aryl azidoacrylates followed by annulation to provide the desired indole products in moderate to good yields.

One-pot three-component approach to the synthesis of polyfunctional pyrazoles

A simple, multicomponent, and straightforward reaction of vinyl azide, aldehyde, and tosylhydrazine affords the construction of 3,4,5-trisubstituted 1H-pyrazoles regioselectively in the presence of base with moderate to excellent yields. A range of functionality could be tolerated in this methodology, and a possible mechanism is proposed.