Reaktion #337951

Reaktionsgleichung

3-bromo-2-(4-fluorophenyl)-6,7-dihydro-5H-pyrrolo[1,2-a]imidazole

(1-isobutyl-2-amino-1H-benzimidazol-6-yl)boronic acid

sodium carbonate

→

1-isobutyl-2-amino-6-(2-(4-fluorophenyl)-6,7-dihydro-5H-pyrrolo[1,2-a]imidazol-3-yl)-1H-benzimidazole

Ausbeute 31.3%

Lösungsmittel

dimethoxyethane

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturCool to room temperature
2. 2
   Extraktionextract with ethyl acetate (150 ml)
3. 3
   TrocknenDry over magnesium sulfate
4. 4
   Einengenconcentrate under reduced pressure
5. 5
   workup.WAIT50 95% B in 1 minute

Vorschrift

Bubble nitrogen through a solution of 3-bromo-2-(4-fluorophenyl)-6,7-dihydro-5H-pyrrolo[1,2-a]imidazole (750 mg, 2.67 mmol) in dimethoxyethane (20 ml). Add bis(triphenylphosphine)palladium(II) chloride (175 mg, 0.095 mmol) and stir at room temperature for 3 minutes. Add (1-isobutyl-2-amino-1H-benzimidazol-6-yl)boronic acid (750 mg, 3.211 mmol) by 2M aqueous sodium carbonate (2.7 mL, 5.40 mmol). Heat at 90° C. for 16 hours. Cool to room temperature, dilute with water (50 ml), and extract with ethyl acetate (150 ml). Dry over magnesium sulfate and concentrate under reduced pressure. Subject the residue to HPLC (Xterra MS C18 5 μm, 19×100 mm; Solvent A: 10 mM ammonium carbonate at pH 9; Solvent B: acetonitrile; Gradient: from 35 to 50% B in 8 minutes and then 50 95% B in 1 minute; Flow rate: 20 mL/min) to provide 1-isobutyl-2-amino-6-(2-(4-fluorophenyl)-6,7-dihydro-5H-pyrrolo[1,2-a]imidazol-3-yl)-1H-benzimidazole (325 mg, 31%). MS (ES): m/z=390 (M++H) The free base is treated with two equivalents of methanesulfonic acid essentially as previously described to provide the title compound (50%).

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