Metal-free intramolecular amination: one-pot tandem synthesis of 3-substituted 4-quinolones

Double heteroannulation of S,N-acetals: a facile access to quinolone derivatives

A library of 3-aryl-4-quinolones and their benzo-fused heterocycles was synthesized from single S,N-acetal precursors.

Metal-free domino one-pot protocols for quinoline synthesis

Metal-free domino one-pot protocols for quinoline synthesis have been reviewed.

Phosphine-Initiated General-Base-Catalyzed Quinolone Synthesis

Phosphinocatalysis provides a new approach toward 3-substituted-4-quinolones. A simple procedure, which uses Ph3P as an inexpensive catalyst and S-phenyl 2-(N-tosylamido)benzothioates and activated alkynes as starting materials, provides direct access to several 3-aroyl-4-quinolones and methyl 4-quinolone-3-carboxylate esters. The reaction presumably occurs through general base catalysis, with the initial addition of Ph3P to the activated alkyne generating the phosphonium enoate zwitterion, which acts as the strong base that initiates the reaction.

Regioselective synthesis of fused oxazepinone scaffolds through one-pot Smiles rearrangement tandem reaction

The paper describes a convenient and facile methodology for the regioselective synthesis of fused oxazepinone scaffolds. This process is an efficient construction of the oxazepinone scaffold by a one-pot coupling/Smiles rearrangement/cyclization approach. This transition metal-free process has potential applications in the synthesis of biologically and medicinally relevant compounds.