p-Toluenesulfonic acid monohydrate → Ethyl (+/-)-3-[4-hydroxy-1-butyl]-5H-dibenzo[a,d]cycloheptene-10-acetate

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Reaction Steps

A solution of ethyl (±)-3-[4-(2-tetrahydropyranyloxy)-1-butyl]-5H-dibenzo[a,d]cycloheptene-10-acetate (456.0 mg, 1.04 mmole) and p-toluenesulfonic acid monohydrate (60 mg, 0.31 mmole) in absolute EtOH (10 mL) was stirred at RT. After 2 hr, the reaction was quenched with 5% NaHCO3 (1 mL) and concentrated to remove the EtOH. The residue was diluted with H2O (2 mL) and extracted with CH2Cl2. Drying (MgSO4), concentration, and silica gel chromatography (1:1 EtOAc/hexanes) gave the title compound (342.4 mg, 93%) as a colorless oil: TLC (1:1 EtOAc/hexanes) Rf 0.49; 1H NMR (250 MHz, CDCl3) δ 6.85-7.25 (m, 7 H), 4.34 (d, J=15.1 Hz, 1 H), 4.08-4.30 (m, 2 H), 3.75-3.95 (m, 2 H), 3.53-3.72 (m, 2 H), 3.33 (dd, J=15.1, 4.1 Hz, 1 H), 2.95 (dd, J=15.1, 9.4 Hz, 1 H), 2.40-2.75 (m, 4 H), 1.45-1.80 (m, 4 H), 1.27 (t, J=7.1 Hz, 3 H); MS (ES) m/e 353 (M+H)+.

Provenance & Evidence