Реакция #48039

Уравнение реакции

N-[(4-chlorophenyl)sulfonyl]-1-(4-chlorophenyl)-5-phenyl-4,5-dihydro-(1H)-pyrazole-3-carboxamide

PCl5

HCl

DIPEA

→

N-[(4-chlorophenyl)sulfonyl]-N′-methyl-1-(4-chlorophenyl)-5-phenyl-4,5-dihydro-(1H)-pyrazole-3-carboxamidine

Выход 15.0%

Растворители

methylamine

chlorobenzene

dichloromethane

Условия реакции

Обработка

1. 1
   ТемператураAfter cooling the mixture to room temperature the residue
2. 2
   workup.STIRRINGThe resulting mixture is stirred for 16 hours at room temperature
3. 3
   Промывкаtwice washed with water
4. 4
   Сушкаdried over MgSO4
5. 5
   Фильтрацияfiltered
6. 6
   Концентрированиеconcentrated in vacuo
7. 7
   ДругоеThe resulting residue is further purified by flash chromatography (silica gel, dichloromethane/acetone=99/1 (v/v/),
8. 8
   Другоеfollowed by crystallization from diisopropyl ether

Методика

Part B: A stirred mixture of N-[(4-chlorophenyl)sulfonyl]-1-(4-chlorophenyl)-5-phenyl-4,5-dihydro-(1H)-pyrazole-3-carboxamide (2.36 gram, 5 mmol), PCl5 (1.15 g, 5.5 mmol) and chlorobenzene (50 ml) is heated for 90 minutes at 140° C. After cooling the mixture to room temperature the residue is dissolved in dichloromethane and methylamine.HCl (0.34 g, 5 mmol) and DIPEA (1.74 ml, 10 mmol) are successively added. The resulting mixture is stirred for 16 hours at room temperature, twice washed with water, dried over MgSO4, filtered and concentrated in vacuo. The resulting residue is further purified by flash chromatography (silica gel, dichloromethane/acetone=99/1 (v/v/), followed by crystallization from diisopropyl ether to give N-[(4-chlorophenyl)sulfonyl]-N′-methyl-1-(4-chlorophenyl)-5-phenyl-4,5-dihydro-(1H)-pyrazole-3-carboxamidine (0.36 gram, 15% yield). Melting point: 134-144° C. Rf (silica gel, diethyl ether=0.4).

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