Stannous chloride dihydrate → HCID 22473529, compound

Participants

Reaction Steps

A cooled (0° C.) suspension of crude 4′-fluoro-3′-nitrobiphenyl-2-carbonitrile (10.7 g, 44 mmol) in ethanol (80 ml) and tetrahydrofuran (80 ml) was treated with tin(II) chloride dihydrate (29.8 g, 132 mmol) and this mixture was stirred at ambient temperature for 12 h. The solvent was removed in vacuo and the residue treated with ice-cold 2N sodium hydroxide (400 ml). The resulting slurry was stirred at ambient temperature for 60 min then extracted with dichloromethane (2×400 ml). The organics were combined, washed with water, brine, dried over anhydrous magnesium sulfate, filtered and pre-adsorbed onto silica. Purification by chromatography on silica gel eluting with isohexane on a gradient of ethyl acetate (5-40%) gave 3′-amino-4′-fluorobiphenyl-2-carbonitrile as a cream-coloured solid (4.3 g, 46% over 2 steps): δH (400 MHz, CDCl3) 3.85 (2H, br), 6.84 (1H, ddd, J 8, 4 and 2), 6.95 (1H, dd, J 8 and 2), 7.07 (1H, dd, J 11 and 8), 7.40-7.46 (2H, m), 7.57-7.62 (1H, m), 7.72-7.74 (1H, m).

Provenance & Evidence