تفاعل #792161

معادلة التفاعل

hexachloroethane

N-dimethylsulfamoylpyrazole

n-butyllithium

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title product

3-Chloro-N,N-dimethyl-1H-pyrazole-1-sulfonamide

المذيبات

tetrahydrofuran

hexane

tetrahydrofuran

ظروف التفاعل

المعالجة

1. 1
   workup.ADDITIONUpon completion of the addition the reaction mixture
2. 2
   درجة الحرارةwas maintained at ˜78° C. for an additional 45 minutes
3. 3
   درجة الحرارةThe reaction mixture was maintained for an hour at ˜78° C.
4. 4
   درجة الحرارةwarmed to ˜20° C.
5. 5
   أخرىquenched with water (1 L)
6. 6
   استخلاصThe reaction mixture was extracted with methylene chloride (4×500 mL)
7. 7
   تجفيفthe organic extracts were dried over magnesium sulfate
8. 8
   تركيزconcentrated
9. 9
   أخرىThe crude product was further purified by chromatography on silica gel

الإجراء التجريبي

To a solution of N-dimethylsulfamoylpyrazole (188.0 g, 1.07 mol) in dry tetrahydrofuran (1500 mL) at ˜78° C. was added dropwise a solution of 2.5 M n-butyllithium (472 mL, 1.18 mol) in hexane while maintaining the temperature below ˜65° C. Upon completion of the addition the reaction mixture was maintained at ˜78° C. for an additional 45 minutes, after which time a solution of hexachloroethane (279 g, 1.18 mol) in tetrahydrofuran (120 mL) was added dropwise. The reaction mixture was maintained for an hour at ˜78° C., warmed to ˜20° C. and then quenched with water (1 L). The reaction mixture was extracted with methylene chloride (4×500 mL); the organic extracts were dried over magnesium sulfate and concentrated. The crude product was further purified by chromatography on silica gel using methylene chloride as eluent to afford the title product compound as a yellow oil (160 g).

المصدر