Stannous chloride dihydrate → 3-Amino-5-bromobenzonitrile
Reaktionsgleichung
[Br:1][C:2]1[CH:3]=[C:4]([CH:7]=[C:8]([N+:10]([O-])=O)[CH:9]=1)[C:5]#[N:6].O.O.Cl[Sn]Cl>C1COCC1.CCO>[NH2:10][C:8]1[CH:7]=[C:4]([CH:3]=[C:2]([Br:1])[CH:9]=1)[C:5]#[N:6]Komponenten
5
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 2
Versuchsvorschrift
To a stirring solution of 845 mg (3.72 mmol) of 3-bromo-5-nitrobenzonitrile in 5 mL of THF and 5 mL of EtOH was added 4.2 g (18.6 mmol) of SnCl2.2H2O in several portions. The reaction became slightly exothermic and was stirred at r.t. for about 12.5 h. The mixture was concentrated and 30 mL of 2 N NaOH was added. After the mixture was stirred for 2 h, H2O and EtOAc were added, and the organic layer was washed with 50 mL of H2O and 40 mL of brine. The aqueous layer was extracted with EtOAc and washed with brine. The combined extracts were dried over Na2SO4, filtered, and concentrated. Purification by flash silica gel chromatography (35% EtOAc/hexanes) provided 461 mg of 3-amino-5-bromobenzonitrile as a yellow solid in 63% yield.