4-Aminopyridine → HCID 59023800, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 5-bromo-2-(4-methoxy-benzyl)-2H-indazole-7-carboxylic acid, phenylamide (prepared from preparation #12a using general procedures V and B, 75.0 mg, 0.20 mmol), 4-aminopyridine(24.0 mg, 0.25 mmol), cesium carbonate (195 mg, 0.60 mmol), and XANTPHOS (11.6 mg, 0.02 mmol) was suspended in 1,4-dioxane (2.5 mL) at ambient temperature under an inert atmosphere. Tris(dibenzylideneacetone)dipalladium(0) (9.2 mg, 0.01 mmol) was added and nitrogen gas was bubbled through the resulting suspension for about 5 minutes. The reaction mixture was heated at about 95° C. for about 2 hours. The resulting mixture was allowed to cool to ambient temperature and filtered through a celite pad and the solvent was removed under reduced pressure. The residue was dissolved in trifluoroacetic acid (4.0 mL) containing triisopropylsilane (51.0 uL, 0.25 mmol) and the mixture was heated at about 100° C. in a microwave reactor for about 15 minutes. Solvents were removed under reduced pressure and the residue was purified preparative RP-HPLC (Rainin C18, 8 mm, 300 Å, 35 cm; 5-100% acetonitrile/0.1 M ammonium acetate over 20 min, 100% acetonitrile hold 10 minutes, 21 mL/min) to afford N-phenyl-5-(pyridin-4-ylamino)-1H-indazole-7-carboxamide (30 mg, 46%) as an off-white solid, RP HPLC (Table 1, Method e) Rt=1.32; MS m/z: (MH)+ 330.

Provenance & Evidence