Methanol → HCID 18641633, compound

Temperature

-78 °C

[1R,3S]1-Aminomethyl-5,6-dimethoxy-3-phenyl-1,2,3,4-tetrahydro-naphthalene hydrochloride (0.2 g, 0.67 mmol), from Step 1, was suspended in 13 mL of methylene chloride and the suspension was cooled to -78° C. in a dry ice/acetone bath. Boron tribromide (3 mL of a 1M solution in methylene chloride, 3 mmol) was added and the reaction mixture was allowed to warm to ambient temperature, kept at ambient temperature for 1.5 h then cooled to -78° C. Methanol (3 mL) was added to the reaction mixture and it was again allowed to warm to ambient temperature then concentrated in vacuo. The residue was redissolved in methanol and reconcentrated. The residue was again redissolved in methanol and the methanol solution was added to a large excess of diethyl ether. The resultant precipitate was filtered and recrystallized from ethanol/diethyl ether to give 0.14 g (64% yield) of the title compound as a white powder, m.p. 256°-259° C. 1H NMR (d6 -DMSO) delta 1.63 (q, 1H), 2.1-2.25 (m, 1H), 2.4-2.5 (m, 1H), 2.75-2.95 (m, 2H), 3.02 (dd, 1H), 3.15-3.3 (m, 1H), 3.4-3.5 (m, 1H), 6.68 (s, 2H), 7.2-7.3 (m, 1H), 7.3-7.4 (m, 4H), 7.8 (br s, 3H), 8.2 (br s, 1H), 9.1 (br s, 1H).

1. temperatureto warm to ambient temperature
2. temperaturethen cooled to -78° C
3. temperatureto warm to ambient temperature
4. concentrationthen concentrated in vacuo
5. dissolutionThe residue was redissolved in methanol
6. dissolutionThe residue was again redissolved in methanol
7. additionthe methanol solution was added to a large excess of diethyl ether
8. filtrationThe resultant precipitate was filtered
9. customrecrystallized from ethanol/diethyl ether

ORD record

ord-e31279669fd7401585abae8d65dfb1f6

Source dataset

uspto-grants-1990_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04963568