Cesium carbonate → 5-{3-[1-(4-amino-3-methyl-1H-pyrazolo[3,4-d]pyrimidin-1-yl)ethyl]-6-cyano-2-ethoxy-5-methylphenyl}-N,N-dimethylpyridine-2-carboxamide

Participants

Reaction Conditions

Reaction Steps

Cesium carbonate (4000 mg, 10 mmol) was added to a mixture of 3-methyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine (1300 mg, 8.5 mmol) and 5-[3-(1-chloroethyl)-6-cyano-2-ethoxy-5-methylphenyl]-N,N-dimethylpyridine-2-carboxamide (2.1 g, 5.6 mmol) in N,N-dimethylformamide (100 mL). The reaction was stirred at 80° C. for 3 hrs and monitored by LC/MS. The reaction mixture was diluted with EtOAc, washed with water, brine, dried over Na2SO4, filtered and concentrated to give the crude product. The product was purified by FCC on silica gel eluting (hexane/10% EtOH in EtOAc, gradient 0-100%) gradient to give the title compound (2.1 g, 77%). LCMS calculated for C26H29N8O2(M+H)+: m/z=485.2; found: 485.2. 1H NMR (500 MHz, DMSO-d6) δ 8.70-8.63 (m, 1H), 8.10 (s, 1H), 8.06 (dd, J=8.0, 2.2 Hz, 1H), 7.69 (d, J=8.1 Hz, 1H), 7.51 (s, 1H), 6.34 (q, J=7.0 Hz, 1H), 3.59-3.47 (m, 1H), 3.33 (m, 1H), 3.03 (s, 3H), 2.96 (s, 3H), 2.57 (s, 3H), 2.45 (s, 3H), 1.79 (d, J=7.1 Hz, 3H), 0.90 (t, J=7.0 Hz, 3H). The enantiomers were separated by Chiral column HPLC using: AD column 20×25 cm, eluting hexane; 30% ethanol @ 13 mL/min 5 mg/injection to give: First peak retention time: 1.63 minutes, 5-{3-[1-(4-amino-3-methyl-1H-pyrazolo[3,4-d]pyrimidin-1-yl)ethyl]-6-cyano-2-ethoxy-5-methylphenyl}-N,N-dimethylpyridine-2-carboxamide; Second peak retention time: 4.13 minutes, 5-{3-[1-(4-amino-3-methyl-1H-pyrazolo[3,4-d]pyrimidin-1-yl)ethyl]-6-cyano-2-ethoxy-5-methylphenyl}-N N-dimethylpyridine-2-carboxamide.

Provenance & Evidence