Acetyl chloride → 1,2-diacetyl-4-methoxymethylene-1,4-dihydro-2H-cinnolin-3-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 1,2-diacetyltetrahydrocinnolin-3-one (0.34 g, 1.5 mmol) in N,N-dimethylformamide (3.6 mL) is added acetyl chloride (5 mL) and trimethylorthoformate (0.64 mL, 6.0 mmol). The mixture is heated at reflux in a 130° C. oil bath for 12 hours under a nitrogen atmosphere and then is allowed to cool to room temperature. The reaction mixture is purified in three batches via semi-preparative HPLC (Prodigy ODS3 column, 5% MeCN/95% water/0.01% trifluoroacetic acid to 100% acetonitrile over 1 hour at 10 mL/min) to give 1,2-diacetyl-4-methoxymethylene-1,4-dihydro-2H-cinnolin-3-one (0.18 g).

Provenance & Evidence