Dichloromethane → HCID 10487090, compound

To a suspension of furan-3-carboxylic acid (36 g, 0.32 mol) in 250 ml of toluene was added 49 g (0.385 mol) of oxalyl chloride and 1 drop of pyridine, and the mixture was heated at 80°-90° C. for 1.5 h. The mixture was cooled to room temperature, N,O-dimethylhydroxylamine hydrochloride (35 g, 0.36 mol), 4-dimethylaminopyridine (DMAP, 1.8 g, 0.0147 mol), and 600 ml of methylene chloride were added. The mixture was cooled to 0° C., 68.4 g of pyridine was added slowly, the mixture was allowed to warm to room temperature and stirred for 2 h. The mixture was filtered, and the filtrate was washed with water, 5% aqueous dimethylaminopropylamine, water, 6N HCl solution, water, and brine. The organic layer was dried and concentrated in vacuo, and the residue was distilled (b.p. 85°-87° C./0.2 mm) to afford 44 g (88.7%) of 3-(N-methyl-N-methoxycarbamoyl)furan.

1. temperaturethe mixture was heated at 80°-90° C. for 1.5 h
2. temperatureThe mixture was cooled to 0° C.
3. temperatureto warm to room temperature
4. filtrationThe mixture was filtered
5. washthe filtrate was washed with water, 5% aqueous dimethylaminopropylamine, water, 6N HCl solution, water, and brine
6. customThe organic layer was dried
7. concentrationconcentrated in vacuo
8. distillationthe residue was distilled (b.p. 85°-87° C./0.2 mm)

ORD record

ord-02117c5d03e641a2afb20aa6412b7009

Source dataset

uspto-grants-1997_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05604224