Selenium Dioxide → 8-Chloro-6-methyl-5-oxo-5,6-dihydrobenzo[c][2,7]naphthyridine-4-carbaldehyde

Participants

Reaction Conditions

Reaction Steps

To a solution of 8-chloro-4,6-dimethylbenzo[c][2,7]naphthyridin-5(6H)-one (100 mg, 0.387 mmol), prepared as described in Example 16, Part G, in AcOH (4 mL) was added selenium dioxide (51.5 mg, 0.464 mmol). The reaction mixture was allowed to stir at 70° C. for 3 h. Volatiles were removed under reduced pressure and the residue so obtained was dissolved in dichloromethane (2 mL). The mixture was filtered through diatomaceous earth (Celite®) and the filtrate was concentrated under reduced pressure to afford the title product (0.1 g, 0.202 mmol, 52% crude yield) as pale yellow solid. The material was carried on without further purification. LC/MS, (ESI) m/z 273.0 [(M+H)+, calcd for C14H10ClN2O2, 273.0]; LC/MS retention time (method H): tR=1.89 min.

Provenance & Evidence