Water → HCID 68737970, compound

Participants

Reaction Steps

To a solution of Example 64A (75 mg, 0.19 mmol) in pyridine (2 mL) was added 1-isocyanatopropane (16 mg, 0.19 mmol) and the reaction mixture was stirred at ambient temperature for about 3 hours. Additional isocyanate (0.1 mL) was added and the mixture was heated at about 80° C. for about 16 hours. The reaction mixture was cooled to ambient temperature and water (5 mL) was added. The resulting precipitate was collected by filtration then treated with hydrochloric acid (4 N solution in dioxane, 3 mL) and stirred at room temperature for about 4.5 hours. Diethyl ether (5 mL) was added and the precipitate collected by filtration. 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 9.34 (s, 1H), 8.50 (s, 1H), 8.42 (s, 1H), 7.80 (d, J=8.7 Hz, 1H), 7.38 (d, J=8.7 Hz, 1H), 7.31-7.48 (m, 5H), 5.65 (s, 2H), 3.18 (dd, J=6.6, 12.7 Hz, 2H), 1.51 (dd, J=7.1, 14.3 Hz, 2H), 0.91 (t, J=7.3 Hz, 3H). MS (ESI+) m/z 376 (M+H)+.

Provenance & Evidence