Sulfuryl chloride → 2-Chloro-6-trifluoromethylbenzothiazole

Sulfuryl chloride (40 mL) was added with stirring to 2-mercapto-6-(trifluoromethyl)-benzothiazole (18.0 g, 76.7 mmol) at <20° C. under a nitrogen atmosphere, and the suspension was then stirred at rt for 2 h. The reaction mixture was poured into ice water with stirring. Precipitation was formed, and stirring was continued for 2 h. The solid precipitate was filtered, and rinsed with water. The wet filter cake was dissolved in 100 mL EtOAc, and the solution was washed with 100 mL water and 50 mL saturated aqueous NaHCO3 solution, then dried over Na2SO4. EtOAc was removed by rotary evaporation, and the residue was dried in vacuo to afford the desired product as a light yellow solid (16.5 g, 91%). GC-EIMS m/z 237 (M+); 1H NMR (CDCl3) δ 8.10 (s, 1H), 8.00 (d, 1H), 7.70 (d, 1H).

1. stirringwith stirring
2. customPrecipitation
3. customwas formed
4. stirringstirring
5. waitwas continued for 2 h
6. filtrationThe solid precipitate was filtered
7. washrinsed with water
8. dissolutionThe wet filter cake was dissolved in 100 mL EtOAc
9. washthe solution was washed with 100 mL water and 50 mL saturated aqueous NaHCO3 solution
10. dry with materialdried over Na2SO4
11. customEtOAc was removed by rotary evaporation
12. customthe residue was dried in vacuo

ORD record

ord-e1742ae286404769a0dbc4b92ccc6cea

Source dataset

uspto-grants-2008_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07423156B2