Reaktion #61075

Reaktionsgleichung

4-bromo-2-(methyloxy)aniline

pyrazole

K2CO3

(1R,2R)-diaminomethylcyclohexane

NaCl

→

title compound

Ausbeute 90.0%

2-(Methyloxy)-4-(1H-pyrazol-1-yl)aniline

Ausbeute 90.0%

Lösungsmittel

EtOAc

NMP

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturIt was cooled down to r.t.
2. 2
   SonstigeThe phases were separated
3. 3
   Waschenthe organic layer was washed with sat.aq
4. 4
   ExtraktionThe combined aqueous layers were extracted back with EtOAc (20 mL)
5. 5
   Trocknenthe combined organic extracts were dried over anh. Na2SO4
6. 6
   FiltrationThe solids were filtered
7. 7
   Sonstigethe solvent evaporated
8. 8
   SonstigeThe crude product was purified by flash chromatography (silica gel, cHex/EtOAc 7:3)

Vorschrift

To a solution of 4-bromo-2-(methyloxy)aniline (400 mg, 1.979 mmol) in anh. NMP (4 mL), at r.t., under N2, were added pyrazole (269 mg, 2 eq), K2CO3 (819 mg, 3 eq), CuI (377 mg, 1 eq) and (1R,2R)-diaminomethylcyclohexane (281 mg, 1 eq). The reaction mixture was stirred at 150° C. for 3 hr. It was cooled down to r.t. and poured into EtOAc/sat.aq. NaCl. The phases were separated and the organic layer was washed with sat.aq. NH4Cl (20 mL) and sat.aq. NaCl (20 mL). The combined aqueous layers were extracted back with EtOAc (20 mL) and the combined organic extracts were dried over anh. Na2SO4. The solids were filtered and the solvent evaporated. The crude product was purified by flash chromatography (silica gel, cHex/EtOAc 7:3) to give the title compound as a brown oil (336 mg, 90%)

Quelle