2-(4-Fluorophenyl)-3-(2-fluoro-4-pyridinyl)-pyrazolo[1,5-a]pyridine → 4-[2-(4-Fluorophenyl)pyrazolo[1,5-a]pyridin-3-yl]-N-[2-(1H-imidazol-5-yl)ethyl]-2-pyridinamine

Participants

Reaction Conditions

Reaction Steps

In a sealed-tube was combined 2-(4-fluorophenyl)-3-(2-fluoro-4-pyridinyl)pyrazolo[1,5-a]pyridine (Example 27. 30 mg, 0.10 mmol) and histamine (40 mg, 0.36 mmol), and the reaction was placed in a pre-heated oil bath at 140° C. The reaction was stirred at 140° C. until consumption of starting material was indicated by TLC analysis (50% ethyl acetate in hexanes). The contents of the sealed-tube were transferred to a flask and concentrated to dryness at 50° C. under high vacuum. The residue was purified by silica gel chromatography to yield the title compound, 23 mg (0.06 mmol, 60%). 1H NMR (d6-DMSO) δ 11.8 (brs, 1H), 8.73 (d, 1H, J=6.8 Hz), 7.94 (d, 1H, J=5.3 Hz), 7.63 (d, 1H, J=9.3 Hz), 7.57 (dd, 2H, J=5.3, 8.6 Hz), 7.48 (s, 1H), 7.30 (t, 1H, J=7.6 Hz), 7.23 (t, 2H, J=9.0 Hz), 6.97 (t, 1H, J=6.8 Hz), 6.75 (brs, 1H), 6.57 (br t, 1H, J=5.3 Hz), 6.44 (s, 1H), 6.33 (d, 1H, J=5.3 Hz), 3.41 (q, 2H, J=6.6 Hz), 2.7 (t, 2H, J=6.6 Hz). MS (ES+ve): 399.1 (50, M+), 305.3 (90), 169.4 (100).

Provenance & Evidence