Reaktion #165518

Reaktionsgleichung

THF

4-chloro-3-((trifluoromethyl)phenyl)-N′-(3-carboxyphenyl)urea

3-aminopyridine

CH2Cl2

DMSO

→

4-chloro-3-((trifluoromethyl)phenyl)-N′-(4-(N-(3-(N-(3-pyridyl)carbamoyl)phenyl)carbamoyl)phenyl)urea

Ausbeute 59.0%

Lösungsmittel

1,2-dichloroethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturheating
2. 2
   Temperaturcooled to room temp.
3. 3
   Filtrationfiltered
4. 4
   FiltrationThe resulting solution was filtered through a plug of silica gel (1 g)
5. 5
   EinengenConcentration under reduced pressure

Vorschrift

A mixture of N-(4-chloro-3-((trifluoromethyl)phenyl)-N′-(3-carboxyphenyl)urea (Method C1f; 0.030 g, 0.067 mmol) and N-cyclohexyl-N′-(methylpolystyrene)carbodiimide (55 mg) in 1,2-dichloroethane (1 mL) was treated with a solution of 3-aminopyridine in CH2Cl2 (1 M; 0.074 mL, 0.074 mmol). (In cases of insolubility or turbidity, a small amount of DMSO was also added.) The resulting mixture was heated at 36° C. overnight. Turbid reactions were then treated with THF (1 mL) and heating was continued for 18 h. The resulting mixtures were treated with poly(4-(isocyanatomethyl)styrene) (0.040 g) and the resulting mixture was stirred at 36° C. for 72 h, then cooled to room temp. and filtered. The resulting solution was filtered through a plug of silica gel (1 g). Concentration under reduced pressure afforded N-(4-chloro-3-((trifluoromethyl)phenyl)-N′-(4-(N-(3-(N-(3-pyridyl)carbamoyl)phenyl)carbamoyl)phenyl)urea (0.024 g, 59%): TLC (70% EtOAc/30% hexane) Rf 0.12.

Quelle