反应详情

Initially, 8-Bromo-2-tetralone was prepared by substituting 2-bromophenylacetylchloride in the procedure described in A. H. Horn, C. J. Grol, D. Dijkstra, A. H. Mulder, J. Med. Chem. 21, 825 (1978). Next, 8-bromo-2-tetralone (25 g, 111.1 mmol), S-(-)-alpha-methylbenzylamine (71.5 ml, 5 eq.), acetic acid (80 ml), 4 A molecular sieves (15 ml), THF (125 ml) and methanol (125 ml) were introduced into a flask and cooled to 0°. Sodium cyanoborohydride (15.1 g, 2 eq.) was added in portions over a 15 min period. The slurry was allowed to stir for 3 hr. The slurry was filtered and the solvent reduced to a syrup by evaporation in vacuo. The residue was partitioned between ether and 2N aqueous sodium hydroxide. The ether layer was washed with water (3×) and brine. After drying over anhydrous sodium sulfate the solvent was removed in vacuo. The viscous oil was placed on a flash silica gel column (5 cm×50 cm) and eluted with ethyl acetate/hexane (8%) to separate the higher Rf (+)-diastereomer (solidifies upon standing, 17g). The solvent was raised to 12% to elute the lower Rf (-)-diastereomer (an oil, 16g). In this manner the 8-bromo-N-[(S)-alpha-methylbenzyl]-2-aminotetralin was obtained.

1. temperaturecooled to 0°
2. filtrationThe slurry was filtered
3. customthe solvent reduced to a syrup by evaporation in vacuo
4. customThe residue was partitioned between ether and 2N aqueous sodium hydroxide
5. washThe ether layer was washed with water (3×) and brine
6. dry with materialAfter drying over anhydrous sodium sulfate the solvent
7. customwas removed in vacuo
8. washeluted with ethyl acetate/hexane (8%)
9. customto separate the higher Rf (+)-diastereomer (solidifies upon standing, 17g)
10. temperatureThe solvent was raised to 12%
11. washto elute the lower Rf (-)-diastereomer (an oil, 16g)