Pyridine → (S)-cyclopropyl(2-methyl-6-(4-nitro-1H-pyrazol-1-yl)-5-phenoxy-3,4-dihydroquinolin-1(2H)-yl)methanone

Participants

Reaction Conditions

Reaction Steps

A 100-mL round-bottom flask equipped with a balloon filled with air was charged with (5)-cyclopropyl(2-methyl-5-phenoxy-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydroquinolin-1(2H)-yl)methanone (0.240 g, 0.55 mmol), 4-nitro-1H-pyrazole (0.188 g, 1.66 mmol), copper (II) acetate (0.301 g, 1.66 mmol), pyridine (0.2 mL), and N,N-dimethylformamide (5 mL), and the resulting mixture stirred overnight at 90° C. The reaction mixture was cooled to room temperature and filtered through a pad of Celite. The filtrate was concentrated, and the residue was purified by preparative thin layer chromatography (eluting with 1:3, ethyl acetate/petroleum ether) to afford (S)-cyclopropyl(2-methyl-6-(4-nitro-1H-pyrazol-1-yl)-5-phenoxy-3,4-dihydroquinolin-1(2H)-yl)methanone (0.060 g, 26%) as yellow oil. MS (ESI, pos. ion) m/z 419 [M+H]+.

Provenance & Evidence