2-Nitrobenzenesulfonyl chloride → 2-(5-Bromo-2-fluorophenyl)-2-difluoromethyl-1-(2-nitro-benzenesulfonyl)-aziridine

Temperature

80 °C

2-Amino-2-(5-bromo-2-fluoro-phenyl)-3,3-difluoro-propan-1-ol (13.04 g, 45.9 mmol) [examples 42 step d)] was dissolved in 261 mL acetonitrile, 2-nitrobenzenesulfonyl chloride (22.38 g, 101 mmol) and potassium hydrogencarbonate (13.79 g, 138 mmol) were added. The mixture was heated to 80° C. and stirred over night. After this period, the reaction mixture was cooled down and partitioned between saturated aqueous NaHCO3 solution and TBME. The layers were separated, washed with brine and TBME. The combined organic layers were dried over MgSO4.H2O and evaporated. The crude product was purified on a silica gel column by eluting with hexane/dichloromethane 2/1->1/2 to give 7.71 g of the title compound as white crystals.

1. waitAfter this period
2. temperaturethe reaction mixture was cooled down
3. custompartitioned between saturated aqueous NaHCO3 solution and TBME
4. customThe layers were separated
5. washwashed with brine and TBME
6. dry with materialThe combined organic layers were dried over MgSO4.H2O
7. customevaporated
8. customThe crude product was purified on a silica gel column
9. washby eluting with hexane/dichloromethane 2/1->1/2

ORD record

ord-f51d69817a754bb9bb0c1befa82f8335

Source dataset

uspto-grants-2012_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08207164B2