Diisopropylethylamine → (S)-3-((4-(4-chlorophenyl)piperidin-1-yl)methyl)-7,8,9,10-tetrahydro-5H-dipyrido[1,2-a:3',2'-e]pyrazin-6(6aH)-one

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(S)-3-(hydroxymethyl)-7,8,9,10-tetrahydro-5H-dipyrido[1,2-a:3′,2′-e]pyrazin-6(6aH)-one (100 mg, 0.429 mmol) was suspended in propionitrile (1 mL) and (cyanomethyl)trimethylphosphonium iodide (125.0 mg, 0.51 mmol) was added followed by N-ethyl-N-isopropylpropan-2-amine (225 ul, 1.3 mmol). To the stirred mixture was then added 4-(4-chlorophenyl)piperidine hydrochloride (109 mg, 0.472 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 (22.1 mg, 12.5%) as a white solid. 1H NMR (DMSO-d6) δ (ppm): 10.46 (s, 1H), 7.64 (d, J=2.0 Hz, 1H), 7.29-7.37 (m, 2H), 7.21-7.28 (m, 2H), 6.96 (d, J=2.0 Hz, 1H), 4.42-4.58 (m, 1H), 3.83 (dd, J=11.4, 2.8 Hz, 1H), 3.32 (s, 2H), 2.80-2.95 (m, 2H), 2.54-2.66 (m, 1H), 1.92-2.08 (m, 3H), 1.83 (br. s., 1H), 1.66-1.77 (m, 2H), 1.33-1.66 (m, 6H). [M+H] calc'd for C23H27ClN4O, 411; found, 411.

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