2,2-Dichloro-1-methylcyclopropanecarboxylic acid → 1-[(2,2-Dichloro-1-methylcyclopropyl)carbonyl]-4-[3-(trifluoromethyl)pyridin-2-yl]piperazine

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Coupling of 1-(3-(trifluoromethyl)pyridin-2-yl)piperazine (271 mg, 1.17 mmol) with 2,2-dichloro-1-methylcyclopropanecarboxylic acid (100 mg, 0.59 mmol) was carried out according to a similar procedure described for example 19A using N,N-dimethylformamide (1 mL) as solvent and benzotriazole-1 yl-oxy-tris-(dimethylamino)-phosphonium hexafluorophosphate (700 mg, 1.56 mmol) as coupling agent. 1-[(2,2-dichloro-1-methylcyclopropyl)carbonyl]-4-[3-(trifluoromethyl)pyridin-2-yl]piperazine was obtained in 56% yield (127 mg) as colorless oil.

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