Trifluoroacetic acid → HCID 178437160, compound

Participants

Reaction Steps

N-(6-Methoxypyridin-3-yl)-3-(2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purin-6-yl)-5-vinylpyridin-2-amine (62.0 mg, 0.140 mmol) and palladium on activated carbon (Aldrich, St. Louis, Mo. 10% Pd, 19.1 mg) were added to MeOH (2.0 mL) and TFA (0.30 mL). The reaction flask was evacuated and back-filled with hydrogen, and the reaction was stirred at room temperature for one hour. Then, the hydrogen balloon was removed, and stirring was continued at room temperature, without the balloon of hydrogen, for 90 minutes. Then, the reaction flask was fitted with a reflux condenser and put in a preheated oil bath (45° C.-50° C.), and stirring was continued under nitrogen overnight. The reaction was cooled to room temperature and filtered through a pad of Celite® (diatomaceous earth), which was washed with DCM and MeOH and a couple of drops of TFA. The filtrate was concentrated and purified on HPLC (10% to 100% MeCN/water with 0.1% TFA over 30 minutes with a total flow rate of 100 mL/min). The fractions with product were collected, concentrated, and dried under high vacuum in a water bath (50° C.). Then, the material was washed with Et2O, MeOH, and Et2O, collected, and dried under high vacuum overnight to give 5-ethyl-N-(6-methoxypyridin-3-yl)-3-(2-methyl-9H-purin-6-yl)pyridin-2-amine (17.8 mg, 35% yield). MS (ESI pos. ion) m/z 362 (M+H)+. 1H NMR (400 MHz, d6-DMSO) δ 12.53 (s, 1H), 9.72 (s, 1H), 8.62 (s, 1H), 8.53 (d, J=2.54 Hz, 1H), 8.22-8.13 (m, 2H), 6.84 (d, J=8.8 Hz, 1H), 3.84 (s, 3H), 2.85 (s, 3H), 2.65 (q, J=7.37 Hz, 2H), 1.26 (t, J=7.53 Hz, 3H).

Provenance & Evidence