6-Methoxy-alpha-tetralone → 6-Methoxy-1-tetralone oxime

A solution of 6-methoxy-3,4-dihydronaphthalen-1(2H)-one (5 g, 28.4 mmol), hydroxylamine hydrochloride (2.366 g, 34.0 mmol) and sodium acetate (2.79 g, 34.0 mmol) in anhydrous methanol (20 mL) was heated at 80° C. (oil bath temp.) for 2 h. The reaction mixture was cooled to room temperature and concentrated under reduced pressure. Next, 75 mL of water was added to the resulting solid and the contents were triturated and filtered. The solid was washed with addition water (2×50 mL), toluene (50 mL) and then dried for 80 h to yield 4.2 g of the oxime as a white solid. A second crop of additional product (1.1 g of pink solid) was obtained from the mother liquor. 1H NMR (400 MHz, CDCl3) δ ppm 1.83-1.91 (m, 2H) 2.70-2.83 (m, 4H) 3.81 (s, 3H) 6.66 (d, J=2.76 Hz, 1H) 6.77 (dd, J=8.78, 2.76 Hz, 1H) 7.83 (d, J=8.78 Hz, 1H) 8.32 (br. s., 1H).

1. concentrationconcentrated under reduced pressure
2. additionNext, 75 mL of water was added to the resulting solid
3. customthe contents were triturated
4. filtrationfiltered
5. washThe solid was washed with addition water (2×50 mL), toluene (50 mL)
6. customdried for 80 h

ORD record

ord-1917a302a0ac47fda5b4cbaa5c927be0

Source dataset

uspto-grants-2015_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09216972B2