Stannous chloride dihydrate → 5'-Amino-5,2'-difluorobiphenyl-2-carbonitrile

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Reaction Steps

5,2′-Difluoro-5′-nitrobiphenyl-2-carbonitrile (3.25 g, 12.5 mmol) in tetrahydrofuran (20 ml) and ethanol (20 ml) was treated with tin(II) chloride dihydrate (9.86 g, 43.8 mmol) and the mixture left to stir at ambient temperature for 18 h. The solvent was evaporated and the residue stirred with 2 N sodium hydroxide solution (40 ml) for 2 h. The resulting suspension was diluted with water (100 ml) and extracted with dichloromethane (3×200 ml). The combined organics were washed with water (200 ml), brine (200 ml), dried over anhydrous sodium sulfate, filtered and evaporated to give the title compound as a brown solid: 1H NMR (360 MHz, CDCl3) δ3.68 (2H, s), 6.67-6.76 (2H, m), 7.02 (1H, dd, J 9, 9 Hz), 7.12-7.27 (2H, m), 7.78 (1H, dd, J9, 6 Hz).

Provenance & Evidence