Trifluoroacetic acid → 3-Chloro-6-(1-piperazinyl)pyridazine

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Reaction Steps

To an ice cold solution of 4-(6-chloropyridazin-3-yl)piperazine-1-carboxylic acid tert-butyl ester (2.00 g, 6.69 mmol) in dichloromethane (10 mL) was carefully added trifluoroacetic acid (2 mL). The mixture was stirred for 45 minutes at room temperature and then concentrated in vacuo to afford the crude 3-chloro-6-piperazin-1-ylpyridazine (˜1.0 g) which was used in the next reaction without further purification. MS (ES+) m/z 199.1 (M+1).

Provenance & Evidence