Reaktion #679641

Reaktionsgleichung

tert-butyl 4-amino-1H-pyrazole-1-carboxylate

triethylamine

Et2O

2,4-dichloro-5-trifluoromethylpyrimidine

→

title compound

tert-Butyl 4-((4-chloro-5-(trifluoromethyl)pyrimidin-2-yl)amino)-1H-pyrazole-1-carboxylate

Lösungsmittel

DCE t-BuOH

DCE t-BuOH

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added
2. 2
   Einengenbefore concentrating in vacuo
3. 3
   workup.ADDITIONadding gradually to 100 mL water
4. 4
   SonstigeThe resulting precipitate was removed by vacuum filtration
5. 5
   Waschenwashed with DCM
6. 6
   SonstigeThe filtrate was purified

Vorschrift

A 1.0 M solution of zinc chloride in Et2O (4.0 mL, 4.0 mmol) was added to 2,4-dichloro-5-trifluoromethylpyrimidine (0.49 mL, 3.6 mmol) in a 1:1 mixture of DCE/t-BuOH (40 mL) at 0° C. under a nitrogen atmosphere. The mixture was stirred for 1 hour before tert-butyl 4-amino-1H-pyrazole-1-carboxylate (0.606 g, 3.31 mmol) and triethylamine (0.51 mL, 3.7 mmol) in a 1:1 mixture of DCE/t-BuOH (30 mL) was added. The mixture was allowed to warm to room temperature and stirred for 20 hours before concentrating in vacuo and adding gradually to 100 mL water. The resulting precipitate was removed by vacuum filtration and washed with DCM. The filtrate was purified using silica gel column chromatography (0-30% EtOAc in DCM) to give the title compound A61 (0.170 g, 14%). LCMS-D: rt 3.622 min; m/z 362.1 [M−H]−.

Quelle