6-Methoxy-alpha-tetralone → 7-Methoxy-2,3,4,5-tetrahydro-1H-benzo[b]azepine hydrochloride

6-Methoxytetralone (6.86 g, 39 mmol), hydroxylamine hydrochloride (8.15 g, 117 mmol) and sodium acetate trihydrate (25 g, 184 mmol) were stirred at reflux in a mixture of ethanol (200 ml) and water (50 ml) for 45 min, concentrated in vacuo, and diluted with water (200 ml). The white solid (6-methoxytetralone oxide, 7.44 g) was collected and dried. A portion of this (6.31 g, 33 mmol) was stirred in dry THF (150 ml) under argon as lithium aluminium hydride (1.80 g, 47 mmol) was added portionwise. This mixture was stirred at reflux for 3 h, cooled, and treated successively with water (1.5 ml), 10% NaOH (1.5 ml) and water (4.5 ml). The solids were filtered off, and the filtrate was evaporated to give an amber oil. This was chromatographed on silica, eluting with ethyl acetate, giving the title compound (2.96 g, 50%).

1. concentrationconcentrated in vacuo
2. additiondiluted with water (200 ml)
3. customThe white solid (6-methoxytetralone oxide, 7.44 g) was collected
4. customdried
5. additionwas added portionwise
6. temperatureat reflux for 3 h
7. temperaturecooled
8. filtrationThe solids were filtered off
9. customthe filtrate was evaporated
10. customto give an amber oil
11. customThis was chromatographed on silica
12. washeluting with ethyl acetate

ORD record

ord-693402d738134ffb82f99148e8f21784

Source dataset

uspto-grants-1999_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05972951