Simple and eco-friendly synthesis of polyfunctionalized 2-aminopyrroles from vinyl azides and α-cyano derivatives has been accomplished with a good to excellent yield. The reaction was performed in ethanol/water co-solvent system without catalyst and the workup was facile. A plausible mechanism has been proposed.
A manganese(II) acetate‐catalyzed domino reaction of vinyl azides and 4‐hydroxycoumarin has been developed for the synthesis of polyfunctionalized spirofuranone‐lactams. A wide range of vinyl azides are capable of providing the desired spirofuranone‐lactams in good to excellent yields. The reaction was achieved via thermal decomposition of vinyl azides to 2H‐azirines, followed by an intramolecular
A novel, convenient and economical protocol to prepare polyfunctionalized benzo[f]indole-4,9-diones catalyzed by Mn(II) acetate from vinyl azides and 2-hydroxynaphthoquinone has been achieved. This reaction proceeded in good to excellent yields for a wide range of vinyl azides, and a possible mechanism has also been proposed. (C) 2015 Published by Elsevier Ltd.
Tuning the Annulation Reactivity of Vinyl Azides and Carbazates: A Divergent Synthesis of Aza-pyrimidinones and Imidazoles
A divergent cascade annulation has been developed using readily available vinyl azides and carbazates with a wide range of substituents. Vinyl azides were successfully applied as bifunctional partners to prepare aza-pyrimidinones via 6-ring closure with carbazates as well as to construct polyfunctionalized imidazoles via 5-ring closure with N-substituted carbazates. The aza-heterocycles were obtained with high levels of chemoselectivity and excellent yields.
Domino Approach for the Synthesis of Pyrrolo[1,2-α]pyrazine from Vinyl Azides
A domino synthesis of pyrrolo[1,2-alpha]pyrazine from 1H-2-pyrrolecarbaldehyde and readily synthesized vinyl azides was developed. This reaction proceeded under relatively mild conditions in the presence of base. Additionally, a possible mechanism for the entire sequence is proposed.