Benzophenone imine → 1-Methyl-1H-indazol-3-amine

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Reaction Steps

A mixture of palladium(II) acetate (82 mg, 2 mol %) and Xantphos (287 mg, 3 mol %) in toluene (10 mL) was stirred for 5 minutes at ambient temperature. To the solution was added a solution of Example 4B (3.68 g, 17.4 mmol) and benzophenone imine (3.00 g, 17.4 mmol) in toluene (30 mL). The mixture was evacuated and purged with nitrogen two times, then stirred at ambient temperature for 15 minutes. Sodium tert-butoxide (1.90 g, 24.4 mmol) was added and the mixture was evacuated and purged with nitrogen. The mixture was heated at between 80 and 85° C. for 2 hours, cooled to ambient temperature, and diluted with water (30 mL). The layers were partitioned and the aqueous layer was extracted with additional toluene (20 mL). The combined organic layers were stirred with 6 N HCl (10 mL) for 1 hour, then 40 mL of water was added to dissolve the solids. The toluene layer was discarded and the aqueous layer filtered to remove insoluble material. The aqueous layer was adjusted to pH 14 with the addition of 50% NaOH and the resulting solid was filtered and dried to provide the title compound. MS (DCI/NH3) m/z 202 (M+H)+.

Provenance & Evidence