Reaktion #48070

Reaktionsgleichung

3-cyclopropyl-4-fluorophenylamine

caesium iodide

iodine

isoamyl nitrite

→

2-cyclopropyl-1-fluoro-4-iodobenzene

Ausbeute 72.0%

Lösungsmittel

DME

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe reaction mixture was cooled to RT
2. 2
   Sonstigepartitioned between pentane and sat. NH4Cl solution
3. 3
   SonstigeThe organic layer was separated
4. 4
   Waschenwashed with 5% sodium thiosulfite and brine
5. 5
   Trocknendried (MgSO4)
6. 6
   Filtrationfiltered
7. 7
   Einengenconcentrated in vacuo
8. 8
   Sonstigeto give a residue which
9. 9
   Sonstigewas purified by flash column chromatography (100% pentane)

Vorschrift

To a solution of 3-cyclopropyl-4-fluorophenylamine (210 mg, 1.39 mmol) in DME (1.5 ml) was added caesium iodide (360 mg, 1.39 mmol), cuprous iodide (82 mg, 0.43 mmol), iodine (176 mg, 0.70 mmol) and isoamyl nitrite (1.11 ml, 8.34 mmol). The reaction mixture was heated to 60° C. for 2 h. The reaction mixture was cooled to RT and partitioned between pentane and sat. NH4Cl solution. The organic layer was separated, washed with 5% sodium thiosulfite and brine, dried (MgSO4), filtered and concentrated in vacuo to give a residue which was purified by flash column chromatography (100% pentane) to yield the desired 2-cyclopropyl-1-fluoro-4-iodobenzene (262 mg, 72%) as a colorless oil. 1H NMR (CDCl3, 300 MHz): 7.40 (m, 1H), 7.17 (m, 1H), 6.76 (m, 1H), 2.02 (m, 1H), 1.03-0.96 (m, 2H), 0.74-0.68 (m, 2H).

Quelle