Dimethylformamide → HCID 20083103, compound

Participants

Reaction Steps

10.7 g (32.9 mmol) of ethyl 6,7-difluoro-4-hydroxy-8-acetoxymethylquinoline-3-carboxylate and 14.2 g (65.8 mmol) of anhydrous potassium carbonate were added to 130 ml of N,N-dimethylformamide, and the solution was stirred at room temperature for 4 hours. 14 g (NET 8.97 g, 49 mmol) of mesitylenesulfonylhydroxyamine was dissolved in 100 ml of methylene chloride, and after drying over sodium sulfate, while cooling on ice, this solution was dropped to the previous solution through 20 minutes. Then, the obtained solution was left overnight as it was. To this solution, 100 ml of water was added, and the solution was stirred at room temperature for 1 hour. The solution was extracted with methylene chloride, and the organic layer was washed. After drying over sodium sulfate, the solvent was removed under reduced pressure and ether was added to the crystal residue. The crystals were filtered off and washed with ether to obtain 6.4 g of the subject compound (97) in a 57% yield. The results of the analysis of this compound were as follows:

Provenance & Evidence