Methanol → 1-Aminomethyl-5-hydroxy-3-phenyl-3,4-dihydronaphthalene

Temperature

-78 °C

1-Aminomethyl-5-methoxy-3-phenyl-3,4-dihydronaphthalene hydrochloride (0.5 g, 1.7 mmol), from Step 2, was suspended in 16 mL of methylene chloride and boron tribromide (5.8 mL of a 1 M solution of BBr3 in methylene chloride) was added dropwise while the reaction mixture was being cooled (to -78° C.) in a dry ice/acetone bath. The reaction mixture was warmed to 0° C. and stirred for 0.5 h, then again cooled to -78° C. in a dry ice/acetone bath. Methanol (2.5 mL) was added dropwise to the reaction mixture, which was then allowed to warm to ambient temperature and concentrated in vacuo. Methanol was added to the residue and the solution was reconcentrated. The residue was dissolved in a small amount of methanol and chromatographed on a silica gel column eluted with ethyl acetate:formic acid:water (18:1:1, v/v/v) to give the formic acid salt of 1-aminomethyl-5-hydroxy-3-phenyl-3,4-dihydronaphthalene, m.p. 102°-104° C.; 1H NMR(d 6-DMSO) δ2.68 (dd, 1H), 3.06 (dd, 1H), 3.6-3.8 (m, 1H), 3.77 (s, 2H), 6.1 (m, 1H), 6.77 (d, 1H), 6.83 (d, 1H), 7.04 (t, 1H), 7.15-7.35 (m, 5H), 8.36 (s, 1H).

1. temperatureThe reaction mixture was warmed to 0° C.
2. temperatureagain cooled to -78° C. in a dry ice/acetone bath
3. temperatureto warm to ambient temperature
4. concentrationconcentrated in vacuo
5. additionMethanol was added to the residue
6. dissolutionThe residue was dissolved in a small amount of methanol
7. customchromatographed on a silica gel column
8. washeluted with ethyl acetate:formic acid:water (18:1:1, v/v/v)

ORD record

ord-4df28eef2ca2483bb52a5d933d89f6d5

Source dataset

uspto-grants-1991_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04994486