Acryloyl chloride → N-{4-Methoxy-2-[8-methyl-2,8-diazaspiro[3.4]octan-2-yl]-5-[(4-pyrazolo[1,5-a]pyridin-3-ylpyrimidin-2-yl)amino]phenyl}prop-2-enamide

Participants

Reaction Steps

A solution of acryloyl chloride (0.766 mL, 0.77 mmol, 1.0 M in CH2Cl2) was added dropwise over 10 minutes to 4-methoxy-6-(8-methyl-2,8-diazaspiro[3.4]octan-2-yl)-N′-(4-pyrazolo[1,5-a]pyridin-3-ylpyrimidin-2-yl)benzene-1,3-diamine (Intermediate 162, 333 mg, 0.73 mmol) in CH2Cl2 (6 mL), which was cooled in an ice/CH3OH bath. The mixture was then stirred for 0.5 h, then diluted with 10% CH3OH in CH2Cl2. The resulting solution was washed with sat. NaHCO3, dried (MgSO4) and concentrated in vacuo. Purification by FCC, eluting with 1-10% methanolic ammonia in CH2Cl2 gave the title compound (193 mg, 52%) as an beige solid after trituration with diethyl ether; 1H NMR: 1.69 (2H, dt), 2.03-2.08 (2H, m), 2.38 (3H, s), 2.63 (2H, t), 3.65 (2H, d), 3.83 (3H, s), 3.94 (2H, d), 5.68 (1H, dd), 6.19 (1H, dd), 6.25 (1H, s), 6.47 (1H, dd), 7.06 (1H, td), 7.19 (1H, d), 7.44 (1H, dd), 7.67 (1H, s), 7.98 (1H, s), 8.29 (1H, d), 8.47 (1H, d), 8.75 (1H, s), 8.78 (1H, d), 9.25 (1H, s); m/z: ES+ MH+ 511.34.

Provenance & Evidence