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

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

3-(hydroxymethyl)-6a,7,9,10-tetrahydropyrido[3,2-e][1,4]thiazino[4,3-a]pyrazin-6(5H)-one (Compound 86C; 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)piperidine 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 precipitate was filtered off and dried in vacuum to afford the title compound (86.1 mg, 56%) as a white solid. 1H NMR (DMSO-d6) δ (ppm): 10.44-10.83 (m, 1H), 7.68 (d, J=1.8 Hz, 1H), 7.30-7.38 (m, 2H), 7.23-7.29 (m, 2H), 6.99 (d, J=2.0 Hz, 1H), 4.83-4.91 (m, 1H), 4.22-4.29 (m, 1H), 3.33 (s, 3H), 2.96-3.07 (m, 1H), 2.83-2.94 (m, 2H), 2.65-2.83 (m, 3H), 2.39-2.48 (m, 1H), 1.91-2.06 (m, 2H), 1.66-1.78 (m, 2H), 1.49-1.66 (m, 2H) [M+H] calc'd for C22H25ClN4OS, 429; found, 429.

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