Formic Acid → 6,7-dihydroxy-4-phenyl-2,3,4,5-tetrahydro-1H-benz[e]isoindole formic acid salt

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Reaction Steps

A suspension of 54.5 mg (0.159 mmol) of 6,7-dimethoxy-4-phenyl-2,3,4,5-tetrahydro-1H-benz[e]isoindole hydrochloride, from Step 6, in 2 mL of methylene chloride was cooled to -78° C. and 0.64 mL of a 1M solution of boron tribromide in methylene chloride was added. The reaction mixture was warmed to ambient temperature for 1 h and recooled to 78° C. before 1 mL of methanol was added. After warming to ambient temperature for 1 h, the solvents were removed in vacuo. Additional methanol (5 mL) was added and removed in vacuo. The product was purified on silica gel eluted with 18:1:1 ethyl acetate:formic acid:water to give 29.8 mg (58% yield) of 6,7-dihydroxy-4-phenyl-2,3,4,5-tetrahydro-1H-benz[e]isoindole formic acid salt as an off white powder, m.p. 144° C. MS DCI: M+ 279. 1H NMR (d6 -DMSO) delta 2.95-3.15 (m, 2H), 3.6-3.9 (m, 3H), 4.1-4.3 (m, 2H), 6.43 (d, 1H, J=7.5 Hz), 6.62 (d, 1H, J=7.5 Hz), 7.1-7.3 (m, 5H), 8.3 (s, 1H).

Provenance & Evidence