Реакция #74612

Уравнение реакции

N,N-diisopropylethylamine

pyridine

5-Chloro-2,4-difluorobenzenesulfonyl chloride

2-amino-5-fluoropyridine

chloromethyl methyl ether

→

title compound

5-Chloro-2,4-difluoro-N-(5-fluoropyridin-2-yl)-N-(methoxymethyl)benzenesulfonamide

Растворители

dichloromethane

dichloromethane

dichloromethane

hydrochloric acid

Условия реакции

Обработка

1. 1
   workup.ADDITIONAfter addition
2. 2
   Температураthe reaction mixture was warmed to room temperature
3. 3
   ЭкстракцияThe aqueous layer was extracted with dichloromethane
4. 4
   ПромывкаThe combined organic layers were washed with water
5. 5
   workup.ADDITIONdiluted with ethyl acetate
6. 6
   Сушкаdried over sodium sulfate
7. 7
   Фильтрацияfiltered
8. 8
   Концентрированиеconcentrated in vacuo
9. 9
   workup.DISSOLUTIONThe residue was dissolved in dichloromethane (8.0 mL)
10. 10
    ТемператураThe mixture was cooled to 0° C.
11. 11
    ТемператураThe reaction mixture was warmed to room temperature
12. 12
    Промывкаwashed with saturated aqueous sodium bicarbonate solution
13. 13
    СушкаThe organic layer was dried over sodium sulfate
14. 14
    Фильтрацияfiltered
15. 15
    Концентрированиеconcentrated in vacuo onto Celite™
16. 16
    ДругоеThe residue was purified by automated flash chromatography (24 g silica gel column)
17. 17
    Промывкаeluting with ethyl acetate

Методика

5-Chloro-2,4-difluorobenzenesulfonyl chloride (1 g, 4 mmol) in dichloromethane (7.6 mL) was added portion-wise to a solution of 2-amino-5-fluoropyridine (498 mg, 4.44 mmol) in pyridine (7.6 mL, 94 mmol) cooled to 0° C. After addition was complete, the reaction mixture was warmed to room temperature. After 16 hours, the reaction mixture was diluted with dichloromethane and hydrochloric acid (1 N aqueous solution). The aqueous layer was extracted with dichloromethane. The combined organic layers were washed with water, diluted with ethyl acetate, dried over sodium sulfate, filtered and concentrated in vacuo. The residue was dissolved in dichloromethane (8.0 mL) and N,N-diisopropylethylamine (0.776 mL, 4.45 mmol) added. The mixture was cooled to 0° C. and chloromethyl methyl ether (0.338 mL, 4.45 mmol) was added dropwise by syringe. The reaction mixture was warmed to room temperature and after stirring for 6 hours, the reaction mixture was diluted with dichloromethane and washed with saturated aqueous sodium bicarbonate solution. The organic layer was dried over sodium sulfate, filtered and concentrated in vacuo onto Celite™. The residue was purified by automated flash chromatography (24 g silica gel column) eluting with ethyl acetate:hexanes (gradient 0:1 to 1:0, by volume) to afford the title compound, 363 mg.

Источник