Реакция #76411

Уравнение реакции

water

Methanesulfonyl chloride

2-hydroxyimino-4-(4-methoxy-phenyl)-but-3-enenitrile

triethylamine

→

2-methylsulfonyloxyimino-4-(4-methoxy-phenyl)-but-3-enenitrile

Выход 41.0%

Растворители

tetrahydrofuran

Условия реакции

Обработка

1. 1
   Другоеthe temperature of the mixture below 5° C
2. 2
   ЭкстракцияThe suspension is extracted with ethyl acetate
3. 3
   Экстракцияthe organic extract
4. 4
   Промывкаis washed neutral with water
5. 5
   Сушкаwith brine, and dried over magnesium sulfate
6. 6
   ДругоеRotary evaporation of the solvent and recrystallization from 80 ml of ethanol

Методика

2-hydroxyimino-4-(4-methoxy-phenyl)-but-3-enenitrile (1.8 g; 9 mmol) is dissolved in 15 ml of anhydrous tetrahydrofuran, and cooled to 0° C. Methanesulfonyl chloride (0.93 ml, 0.012 mol) is added at once, followed by triethylamine (2 ml, 0.015 mol) dropwise over 20 min, keeping the temperature of the mixture below 5° C. The mixture is then stirred at 2° C. for 1 h 15 min, and poured into 200 ml of iced water. The suspension is extracted with ethyl acetate, the organic extract is washed neutral with water, then with brine, and dried over magnesium sulfate. Rotary evaporation of the solvent and recrystallization from 80 ml of ethanol yields 2-methylsulfonyloxyimino-4-(4-methoxy-phenyl)-but-3-enenitrile (1.02 g; 41%) as light yellow hair-like crystals, mp 147-152° C. (dec). 1H-NMR reveals the presence of only one isomer.

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