Acetic Acid → HCID 68738536, compound

Participants

Reaction Steps

A mixture of Example 64A (100 mg, 0.256 mmol), cyclopropanecarbaldehyde (0.057 mL, 0.76 mmol), sodium triacetoxyborohydride (163 mg, 0.76 mmol) and acetic acid (0.044 mL, 0.76 mmol) in 1,2-dichloroethane (5 mL) was stirred at ambient temperature for about 2.5 hours. Hydrochloric acid (4 N in dioxane, 4 mL) was added and the reaction mixture was stirred for about 16 hours. The precipitate was collected by filtration, rinsing with ether (10 mL). The solid was dissolved in dichloromethane (10 mL) and treated with trifluoroacetic acid (0.1 mL) and the reaction mixture was stirred at room temperature for about 2 hours. The reaction mixture was neutralized by the addition of 15% aqueous sodium hydroxide solution (about 15 mL) and the organic layer was separated, dried over magnesium sulfate, filtered and concentrated under reduced pressure. The crude material was purified by reverse-phase HPLC using acetonitrile/water (0.05 M ammonium acetate) gradient elution method to afford the title compound as the acetate salt. 1H NMR (400 MHz, DMSO-d6) δ ppm 11.43 (s, 1H), 8.41 (s, 1H), 8.28 (s, 1H), 7.68 (d, J=8.7 Hz, 1H), 7.32-7.45 (m, 5H), 7.26 (d, J=8.6 Hz, 1H), 6.08 (t, J=5.7 Hz, 1H), 5.64 (s, 2H), 3.12 (t, J=6.2 Hz, 2H), 1.04-1.22 (m, 1H), 0.35-0.53 (m, 2H), 0.17-0.32 (m, 2H). MS (ESI+) m/z 345 (M+H)+.

Provenance & Evidence