反应详情

A solution of 3-(2-chloro-5-methylpyrimidin-4-yl)pyrazolo[1,5-a]pyridine (Intermediate 5, 271 mg, 1.00 mmol), p-toluene sulphonic acid monohydrate (271 mg, 1.43 mmol) and 2-methoxy-4-(1-methyl-3,6-dihydro-2H-pyridin-4-yl)-5-nitroaniline (Intermediate 3, 250 mg, 0.95 mmol) were heated in 2-pentanol (12 mL) at reflux under N2 for 30 h. The mixture was then concentrated in vacuo and the residue was dissolved in CH3OH. Purification by ion exchange chromatography (SCX column), eluting with 7M methanolic ammonia, gave the title compound (283 mg, 63%) as an orange powder after trituration with CH3CN. 1H NMR: 2.28-2.36 (5H, m), 2.44 (3H, s), 2.60 (2H, t), 3.00 (2H, d), 4.00 (3H, d), 5.64 (1H, s), 6.97 (1H, s), 7.13 (1H, m), 7.40 (1H, m), 8.27 (1H, s), 8.39 (1H, s), 8.53 (1H, d), 8.61 (1H, s), 8.83 (1H, d), 8.87 (1H, s); m/z: ES− MH− 470.

1. temperatureat reflux under N2 for 30 h
2. concentrationThe mixture was then concentrated in vacuo
3. dissolutionthe residue was dissolved in CH3OH
4. customPurification by ion exchange chromatography (SCX column)
5. washeluting with 7M methanolic ammonia