Diisopropylethylamine → 3-[4-(2-fluoro-phenyl)-piperazin-1-yl]-6-methyl-2H-pyrrolo[1,2-a]pyrazin-1-one

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A mixture of ethyl 1-(2-(4-(2-fluorophenyl)piperazin-1-yl)-2-iminoethyl)-5-methyl-1H-pyrrole-2-carboxylate (150 mg, 0.4 mmol) and N,N-diisopropylethylamine (1.41 mL, 8 mmol) in tetrahydrofuran (4 mL) was heated at 150° C. in a microwave reactor for 3 h. At this time, the solution was cooled to room temperature. The resulting precipitate was collected by filtration, washed with minimal ethyl acetate and air dried to afford 3-[4-(2-fluoro-phenyl)-piperazin-1-yl]-6-methyl-2H-pyrrolo[1,2-a]pyrazin-1-one (115 mg, 87.5%) as a white solid. 1H NMR (300 MHz, DMSO-d6) δ ppm 10.55 (s, 1H), 7.21-7.06 (m, 3H), 7.05-6.96 (m, 1H), 6.73 (d, 1H), 6.53 (s, 1H), 6.26 (d, 1H), 3.15 (s, 8H), 2.26 (s, 3H). LC-MS calcd. for C18H20FN4O [(M+H)+] 327, obsd. 326.9.

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