Diisopropylethylamine → 3-((4-(4-chlorophenyl)-5,6-dihydropyridin-1(2H)-yl)methyl)-6a,7,9,10-tetrahydropyrido[3,2-e][1,4]thiazino[4,3-a]pyrazin-6(5H)-one

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3-(hydroxymethyl)-6a,7,9,10-tetrahydropyrido[3,2-e][1,4]thiazino[4,3-a]pyrazin-6(5H)-one (100 mg, 0.36 mmol) was suspended in propionitrile (1 mL) and (cyanomethyl)trimethylphosphonium iodide (123.0 mg, 0.51 mmol) was added followed by N-ethyl-N-isopropylpropan-2-amine (180 ul, 1.03 mmol). To the stirred mixture was then added 4-(4-chlorophenyl)-1,2,3,6-tetrahydropyridine hydrochloride (104.5 mg, 0.45 mmol). The reaction was heated to 90° C. with stirring for 2 h. The reaction was then cooled to room temperature and diluted with water (3 mL) and filtered. The solids were collected and refluxed in ethanol (5 mL) for 1 h. The suspension was cooled back to room temperature and filtered. The solids were collected to afford the title compound (79.5 mg, 19%) as a white solid. 1H NMR (DMSO-d6) δ (ppm): 10.66 (s, 1H), 7.70 (d, J=2.0 Hz, 1H), 7.41-7.47 (m, 2H), 7.33-7.40 (m, 2H), 7.02 (d, J=2.0 Hz, 1H), 6.18 (br. s., 1H), 4.88 (dt, J=13.6, 2.7 Hz, 1H), 4.27 (dd, J=10.6, 3.0 Hz, 1H), 3.43 (d, J=3.5 Hz, 2H), 2.98-3.07 (m, 3H), 2.66-2.83 (m, 3H), 2.58-2.65 (m, 2H), 2.39-2.48 (m, 3H). [M+H] calc'd for C22H23ClN4OS, 427; found, 427.

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