3-Methylquinoline → 3-methylquinoline-8-sulfonyl Chloride

The title compound was prepared according to the procedure of U.S. Pat. No. 5,332,822. To 9 mL (135 mmol) of chlorosulfonic acid at 0° C. was added slowly 3-methylquinoline (5.2 g, 36 mmol). The bath was removed and stirring was continued at 100° C. overnight. The reaction mixture was cooled to ambient temperature and then treated with 3.3 mL (45 mmol) of thionyl chloride. The reaction mixture was heated at 70° C. for 1 h, cooled to 0° C. and carefully quenched with ice (very vigorous reaction). The reaction mixture was diluted with 100 mL of water and extracted into dichloromethane (100 mL). The organic phase was washed with water, dried (MgSO4) and concentrated. The residue was triturated with dichloromethane/diethyl ether to provide 1.58 g (18%) of the title compound as a tan solid. 1H-NMR (300 MHz, DMSO-d6) δ9.17-9.29 (m, 2H), 8.32-8.38 (m, 2H), 7.96 (dd, 1H, J=7 Hz), and 2.51 (t, 3H, J=2 Hz).

1. customThe title compound was prepared
2. customThe bath was removed
3. temperatureThe reaction mixture was heated at 70° C. for 1 h
4. temperaturecooled to 0° C.
5. customcarefully quenched with ice (
6. customvery vigorous reaction)
7. extractionextracted into dichloromethane (100 mL)
8. washThe organic phase was washed with water
9. dry with materialdried (MgSO4)
10. concentrationconcentrated
11. customThe residue was triturated with dichloromethane/diethyl ether

ORD-Eintrag

ord-a62a48c0cdec4767acfa9a15b5138ee8

Quelldatensatz

uspto-grants-2001_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06235778B1