Palladium-catalyzed arylation/cyclization/desulfonation cascades toward 4-aryl quinolin-2(1 H )-ones with diaryliodonium salts

4-Aminoalkyl Quinolin-2-one Derivatives via Knorr Cyclisation of ω-Amino-β-Keto Anilides

In a high-yielding and solvent-free procedure N-ethoxycarbonyl protected ω-amino-β-keto anilides undergo Knorr cyclisation in neat polyphosphoric acid to provide straightforward route to 4-aminoalkyl quinolin-2-one derivatives with variable length of the alkyl chain.

Weak Base-Promoted Lactamization under Microwave Irradiation: Synthesis of Quinolin-2(1H)-ones and Phenanthridin-6(5H)-ones

Quinolin-2(1H)-ones and phenanthridin-6(5H)-ones are synthesized in high yields by K₂CO₃-promoted cyclization of N-aryl-β-bromo-α,β-unsaturated amides and N-aryl-2-bromobenzamides in dimethylformamide under microwave irradiation.

Palladium-Catalyzed Ullmann Cross-Coupling of β-Iodoenones and β-Iodoacrylates with o-Halonitroarenes or o-Iodobenzonitriles and Reductive Cyclization of the Resulting Products To Give Diverse Heterocyclic Systems

The palladium-catalyzed Ullmann cross-coupling of β-iodoenones and β-iodoacrylates such as 5 (X = I) with o-halonitroarenes and o-iodobenzonitriles including 2 affords products such as compound 7. These can be engaged in a range of reductive cyclization reactions leading to heterocyclic frameworks such as 3,4-benzomorphan derivative 43.