Maleic Acid → HCID 178481005, compound

Participants

Reaction Steps

A solution of cis-1-[4-(4-methylpiperazino)cyclohexyl]-3-[4-(2-pyrimidinyloxy)-phenyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine (intermediate BD) (0.193 g, 0.0004 mol) in absolute ethanol (15 mL) was heated to reflux. A solution of maleic acid (0.184 g, 0.00159 mol) in absolute ethanol (10 mL) was heated to 78° C. was added and the mixture was heated at reflux for 10 minutes. The mixture was allowed to cool to room temperature, and the white precipitate which formed was collected by filtration and washed with absolute ethanol (2×10 mL). The residual solvent was removed in vacuo to give cis-1-[4-(4-methylpiperazino)cyclohexyl]-3-[4-(2-pyrimidinyloxy)phenyl]-1H-pyrazolo[3,4-d]pyrimidin-4-amine tris maleate as a white solid (0.222 g, 0.00027 mol): 1H NMR (DMSO-d6, 400 MHz) □□□8.68 (d, 2H), 8.26 (s, 1H), 7.72 (d, 2H), 7.39 (d, 2H), 7.32 (t, 1H), 6.17 (s, 6H), 4.85-4.87 (m, 1H), 3.85-2.85 (br, 9H), 2.71 (s, 3H), 2.23-2.43 (bs, 2H), 2.03-2.18 (bs, 2H), 1.71-2.89 (bs, 4H) RP-HPLC (Delta Pak C18, 5 μm, 300 A, 15 cm; 5%-85% acetonitrile-0.1M ammonium acetate over 20 min, 1 mL/min) Rt 9.56 min.

Provenance & Evidence