反応手順
3-(hydroxymethyl)-7,8,9,10-tetrahydro-5H-dipyrido[1,2-a:3′,2′-e]pyrazin-6(6aH)-one (50 mg, 0.214 mmol), N-ethyl-4-(piperazin-1-yl)benzamide (55.0 mg, 0.236 mmol), (cyanomethyl)trimethylphosphonium iodide (67.7 mg, 0.279 mmol) and N,N-diisopropylethylamine (187 μl, 1.072 mmol) were suspended in Propiononitrile (Volume: 644 μl) and heated in a closed vial at 90° C. for 1 h. It was cooled to ambient temperature, the resulting precipitate was filtered, washed with MeCN (5 mL) and dried in vacuum to afford N-ethyl-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)benzamide (56 mg, 0.125 mmol, 58.2% yield) as a white solid. 1H NMR (DMSO-d6) δ 10.43 (s, 1H), 8.12 (t, J=5.6 Hz, 1H), 7.70 (d, J=9.1 Hz, 2H), 7.66 (d, J=2.0 Hz, 1H), 6.98 (d, J=2.0 Hz, 1H), 6.92 (d, J=9.1 Hz, 2H), 4.47-4.55 (m, 1H), 3.83 (dd, J=11.4, 2.8 Hz, 1H), 3.32-3.40 (m, 2H), 3.18-3.28 (m, 6H), 2.61 (td, J=12.6, 2.5 Hz, 1H), 2.43-2.49 (m, 4H), 2.04 (d, J=13.1 Hz, 1H), 1.80-1.91 (m, 2H), 1.64 (d, J=12.6 Hz, 2H), 1.33-1.58 (m, 3H), 1.09 (d, J=14.4 Hz, 3H); [M+H] calc'd for C25H32N6O2, 449; found, 449.
