Ammonium Acetate → (1R,5R)-1-(1-naphthyl)bicyclo[3.1.0]hexan-3-amine

Participants

Reaction Steps

To a solution of (1R,5R)-1-(1-naphthyl)bicyclo[3.1.0]hexan-3-one (480 mg, 2.1 mmol) in methanol (60 mL) was added ammonium acetate (16.8 g, 210 mmol), stirred for 15 min at room temperature and sodium cyanoborohydride (1.08 g, 17 mmol) and the mixture was heated to 60° C. for 2 hours. The reaction was monitored by TLC (ethyl acetate/methanol/triethylamine(89:10:1)). The reaction mixture was concentrated under reduced pressure to remove methanol at 30° C., the crude mass was quenched with water (25 mL) and the aqueous layer was extracted with ethyl acetate (3×100 mL). The aqueous layer was saturated with sodium chloride and re-extracted with ethyl acetate (3×100 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered and evaporated under reduced pressure to yield 1.5 g of crude oil, which was purified by preparative HPLC to give 280 mg (58%) of 99% pure product. 1H NMR δ(300 MHz,CD3OD): 1.10-1.23 (2H,m), 1.86-1.98 (2H,m) 2.25-2.31 (1H,m), 2.44-2.51 (1H,m), 2.90 (1H,m), 4.06-4.08 (1H,m), 7.33-7.56 (4H,m), 7.71-7.74 (1H,d,6 Hz), 7.82-7.85 (1H, d, 9 Hz), 8.20-8.28 (1H, m). 13CNMR(CD3OD): 140.75, 140.30, 135.49, 135.44, 133.92, 129.78, 128.61, 127.75, 127.09, 127.00, 126.72, 126.67, 126.58, 126.52, 125.68, 54.95, 43.05, 40.40, 36.35, 34.52, 33.88, 33.64, 25.86, 24.94, 23.70, 15.70.

Provenance & Evidence