Water → 6-Chloro-2-methyl-2,3-dihydropyridazin-3-one

Temperature

25 °C

To a solution of 6-chloropyridazin-3(2H)-one (600 mg, 4.23 mmol) were added potassium carbonate (1.2 g, 8.46 mmol) and methyl iodide (1.2 g, 8.46 mmol) in DMF (3 mL). The resulting mixture was stirred at 25° C. for 4 h. After the reaction, water was added to the reaction solution, followed by extraction with EtOAc. The organic layer was washed with water and brine, dried over sodium sulfate and then filtered. The filtrate was concentrated under reduced pressure to give the residue which was purified by column chromatography to give 6-chloro-2-methylpyridazin-3(2H)-one (550 mg, 91%). 1H NMR (CDCl3): 3.76 (s, 3H), 6.92 (d, 1H), 7.19 (d, 1H).

1. additionwas added to the reaction solution
2. extractionfollowed by extraction with EtOAc
3. washThe organic layer was washed with water and brine
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationThe filtrate was concentrated under reduced pressure
7. customto give the residue which
8. customwas purified by column chromatography

ORD record

ord-e2bc67ab25104e6d92db74afe24946fe

Source dataset

uspto-grants-2013_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08575156B2