Diisopropylethylamine → 6-[4-(2-chloro-6-fluorobenzyl)-piperazin-1-yl]-3H-pyrimidin-4-one

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A mixture of 6-chloro-3H-pyrimidin-4-one (Intermediate 4; 100 mg, 0.77 mmol), 1-(2-chloro-6-fluorobenzyl)piperazine (Oakwood; 87 mg, 0.38 mmol), and diisopropylethylamine (200 μL, 1.1 mmol) in 2-butanol (5 mL) was heated in a sealed scintillation vial on a hot plate at about 80° C. for 8 hours and then allowed to cool to room temperature and stand at room temperature for 40 hours. The mixture was filtered. The solid was washed with 2-butanol and air-dried to give 6-[4-(2-chloro-6-fluorobenzyl)-piperazin-1-yl]-3H-pyrimidin-4-one (21 mg, 17%) as a white solid, mp 255-256° C. (dec). 1H NMR (d6-DMSO) δ 2.41-2.44 (m, 4H), 3.42-3.45 (m, 4H), 5.24 (s, 1H), 7.19-7.24 (m, 1H), 7.40-7.43 (m, 1H), 7.51-7.56 (m, 1H), 7.87 (s, 1H), 11.61 (br s, 1H). LRMS ES+M+H 323. HRMS Calcd. for C15H17ClFN4O (M+H), 323.1070. Found, 323.1069.

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