Diisopropylethylamine → (S)-4-(4-((6-oxo-6,6a,7,8,9,10-hexahydro-5H-dipyrido[1,2-a:3',2'-e]pyrazin-3-yl)methyl)piperazin-1-yl)benzonitrile

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(S)-3-(hydroxymethyl)-7,8,9,10-tetrahydro-5H-dipyrido[1,2-a:3′,2′-e]pyrazin-6(6aH)-one (86.0 mg, 0.369 mmol) was suspended in propionitrile (1 mL) and (cyanomethyl)trimethylphosphonium iodide (108.0 mg, 0.442 mmol) was added followed by N-ethyl-N-isopropylpropan-2-amine (193 ul, 1.1 mmol). To the stirred mixture was then added 4-(piperazin-1-yl)benzonitrile (76 mg, 0.406 mmol). The reaction was heated to 90° C. with stirring for 16 h. The crude reaction was cooled to room temperature and concentrated to a residue, then taken up in 3 mL DMSO and purified via HPLC (55-90% acetonitrile in water, ammonium bicarbonate buffer). The fractions were combined and concentrated until a white solid precipitated. The precipitate was filtered off and dried in vacuum to afford the title compound (29.7 mg, 20.0%) as a white solid. 1H NMR (DMSO-d6) δ (ppm): 10.48 (s, 1H), 7.65 (s, 1H), 7.57 (d, J=8.8 Hz, 2H), 6.94-7.04 (m, 3H), 4.44-4.55 (m, 1H), 3.79-3.88 (m, 1H), 3.35 (br. s., 2H), 3.30 (br. s., 4H), 2.54-2.69 (m, 1H), 2.45 (br. s., 4H), 1.97-2.09 (m, 1H), 1.80-1.90 (m, 1H), 1.57-1.69 (m, 1H), 1.32-1.56 (m, 3H). [M+H] calc'd for C23H26N6O, 403; found, 403. MP: 212.2° C.

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