Réaction #48039

Équation de réaction

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

Rendement 15.0%

Solvants

methylamine

chlorobenzene

dichloromethane

Conditions de réaction

Traitement

1. 1
   TempératureAfter cooling the mixture to room temperature the residue
2. 2
   workup.STIRRINGThe resulting mixture is stirred for 16 hours at room temperature
3. 3
   Lavagetwice washed with water
4. 4
   Séchagedried over MgSO4
5. 5
   Filtrationfiltered
6. 6
   Concentrationconcentrated in vacuo
7. 7
   AutreThe resulting residue is further purified by flash chromatography (silica gel, dichloromethane/acetone=99/1 (v/v/),
8. 8
   Autrefollowed by crystallization from diisopropyl ether

Mode opératoire

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).

Source