1,1-Dichloroethane → (7-Methoxy-1,2,3,4-tetrahydro-naphthalen-2-yl)-propyl-amine hydrochloride

To a solution of 7-methoxy-3,4-dihydro-1H-naphthalen-2-one (6.0 g, 39.7 mmol) in dichloroethane (130 mL) under an inert atmosphere was added propylamine (3.4 mL, 41.7 mmol, 1.05 eq) followed by sodium triacetoxyborohydride (21 g, 99.3 mmol, 2.5 eq) in a single portion. The reaction was allowed to stir at room temperature for 24 h. The mixture was concentrated in vacuo and partitioned between EtOAc (200 mL) and 5% aq. NaOH (100 mL). The aqueous layer was extracted twice more with EtOAc (2×70 mL). The combined organic layers were washed with brine (100 mL), dried over MgSO4, filtered, and concentrated. The residue was taken up in ether (125 mL) and treated with 1N HCl in ether. The salt was filtered and dried to afford (7-methoxy-1,2,3,4-tetrahydro-naphthalen-2-yl)-propyl-amine hydrochloride as a tan solid (5.0 g).

1. concentrationThe mixture was concentrated in vacuo
2. custompartitioned between EtOAc (200 mL) and 5% aq. NaOH (100 mL)
3. extractionThe aqueous layer was extracted twice more with EtOAc (2×70 mL)
4. washThe combined organic layers were washed with brine (100 mL)
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated
8. additiontreated with 1N HCl in ether
9. filtrationThe salt was filtered
10. customdried

ORD record

ord-031654c8fffd4f5380c1524e93ee2de8

Source dataset

uspto-grants-2005_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06864266B2