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0 °C

A mixture of 2-(4-fluorophenyl)-3-(3-(dimethylamino)-2-propenoyl)-6-trifluoromethylpyrazolo[1,5-a]pyridine (100 mg, 0.27 mmol), guanidinium hydrochloride (52 mg, 0.54 mmol), and sodium ethoxide (73 mg, 1.08 mmol) in EtOH (4 mL) was stirred at reflux for 21 h. Additional guanidine was added in portions to the mixture until starting material was consumed as evidenced by TLC. The reaction mixture was cooled to 0° C. and the resulting precipitate was collected by filtration washed with cold EtOH and dried under vacuum to afford the title compound as a tan solid, 93 mg (92%). 1H NMR (acetone-d6) δ 9.19 (s, 1H), 8.73 (d, 1H, J=9.4 Hz), 8.13 (d, 1H, J=5.2 Hz), 7.78 (m, 2H), 7.63 (d, 1H, J=9.5 Hz), 7.34 (m, 2H), 6.41 (d, 1H, J=5.2 Hz), 6.17 (s, 1H). MS (+ve ion electrospray) 374 (100), (MH+).

1. temperatureat reflux for 21 h
2. customwas consumed
3. filtrationthe resulting precipitate was collected by filtration
4. washwashed with cold EtOH
5. customdried under vacuum