Stannous chloride dihydrate → (1R)-5-Bromo-2,3-dihydro-1H-inden-1-amine

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Reaction Steps

A solution of (R)-1-azido-5-bromo-indane (154 g, 0.645 mol) was dissolved in methanol (2.4 L) and SnCl2.2H2O (265 g, 1.18 mol) was added. The mixture was stirred at room temperature overnight (TLC indicated no starting material) and was concentrated to dryness. The resulting residue was treated with 2N aqueous NaOH (2.5 L) and EtOAc (1.5 L). The mixture was stirred for 1 hour and filtered through Celite® with the aid of EtOAc (3×250 ml). The organic solution was separated and the aqueous layer was extracted with EtOAc (3×2 L). The combined organic extracts were washed with 1 N HCl (2×2 L) followed by water (2 L). The pH of the combined aqueous layers was adjusted to 11 with cold saturated NaOH solution and the mixture was extracted with EtOAc (3×2 L). The combined organic extracts were dried over MgSO4, filtered and concentrated to give (87.5 g, 64.0%) (R)-5-bromo-2,3-dihydro-1H-inden-1-amine as a dark yellow oil which solidified upon refrigeration. MS (ES+) 213.9 (M+H)+. 1H NMR (CDCl3) δ 1.70-1.75 (m, 1H), 2.40-2.45 (m, 1H), 2.77-2.82 (m, 1H), 2.93-2.97 (m, 1H), 4.28-4.33 (m, 1H), 7.18-7.23 (m, 1H), 7.36-7.41 (m, 2H).

Provenance & Evidence