Triethylamine → N-[2-(4-butyrylamino-1-piperidinyl)ethyl]-1-(2-propyl)-1H-indazole-3-carboxamide oxalate

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Reaction Steps

The product from Example 23, as the free base (0.330 g, 1 mmol) and triethylamine (0.15 mL, 1.05 mmol) were stirred in 10.0 mL tetrahydrofuran and cooled briefly in an ice bath. To the mixture was added dropwise butyryl chloride (0.1 mL, 1 mmol) and the resulting mixture was stirred 18 h at room temperature and filtered, and the filtrate was evaporated to 0.389 g oil. Crystallization as the oxalate salt from ethyl acetate/methanol provided 0.149 g colorless crystals. Mp 122° C. Mass spectrum, m+ =399. Anal (C24H35N5O6) theory C, 58.88; H, 7.21; N, 14.32; found C, 58.60; H, 7.15; N, 14.30.

Provenance & Evidence