Water → 1-(1,3-dioxolan-2-ylmethyl)-1,8-naphthyridin-2(1H)-one

Temperature

55 °C

To a solution of 1.2 g of 1,8-naphthyridin-2(1H)-one in 18 mL of N,N-dimethylformamide, 0.36 g of 60% sodium hydride was added, and the mixture was stirred at 50 to 60° C. for 7 minutes. Thereto was added 0.94 mL of 2-bromomethyl-1,3-dioxolan, and the mixture was stirred at 95 to 105° C. for 3 hours. The reaction mixture was cooled to room temperature, water and ethyl acetate were then added thereto, and the organic layer was separated. The aqueous layer was extracted with ethyl acetate and chloroform. The organic layer and the extract were combined, the resultant solution was dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The resultant residue was purified by silica gel column chromatography using an eluent of hexane:ethyl acetate=1:1 to obtain 1.2 g of 1-(1,3-dioxolan-2-ylmethyl)-1,8-naphthyridin-2(1H)-one as a white solid.

1. stirringthe mixture was stirred at 95 to 105° C. for 3 hours
2. temperatureThe reaction mixture was cooled to room temperature
3. customthe organic layer was separated
4. extractionThe aqueous layer was extracted with ethyl acetate and chloroform
5. dry with materialthe resultant solution was dried over anhydrous magnesium sulfate
6. distillationthe solvent was distilled off under reduced pressure
7. customThe resultant residue was purified by silica gel column chromatography

ORD record

ord-cb817cc92aaa4d1ab0f56b9c10fec569

Source dataset

uspto-grants-2013_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08367831B2