2 g) sodium hydroxide was refluxed for 2 h Next, 10 ml of anhydr

Next, 10 ml of anhydrous benzene was added and the

benzene-water #Selleckchem LY3023414 randurls[1|1|,|CHEM1|]# azeotrope was distilled off. The resulting solution was dried over anhydrous calcium chloride and evaporated under vacuum. The dry residue was purified by chromatography using a silica gel-filled column and chloroform-ethanol (10:1 v/v) as eluent. Quinobenzothiazines 7 were obtained as yellow oils. 12-(2-(N-piperidyl)ethyl)-12(H)-quino[3,4-b][1,4]benzothiazine

(7a) Yield 45 %; an oil; 1H NMR (CDCl3, 500 MHz) δ (ppm): 1.10-1.19 (m, 6H, Hpiperidyl), 2.05–2.18 (m, 4H, Hpiperidyl), 2.35–2.47 (t, J = 6.6 Hz, 2H, NpiperidylCH2), 4.12–4.28 (t, J = 6.6 Hz, 2H, CH2), 7.04–7.09 (m, 1H, Harom), 7.16–7.20 (m, 1H, H-11), 7.26–7.29 (m, 1H, Harom), 7.35–7.38 (m, 1H, Harom), 7.58–7.60 (m, 1H, Harom), 7.66–7.68 (m, 1H, Harom), 7.94–7.96 (m, 1H, Harom), 8.08–8.11 (m, 1H, H-1), 8.49 (s, 1H, H-6); EI-MS m/z: 361 (M+, 100 %); Anal. calcd. for C22H23N3S: C, 73.10; H, 6.41; N, 11.62; S, 8.87. Found: C, 73.11; H, 6.33; N, 11.56; S, 8.83. 9-Fluoro-12-(2-(N-piperidyl)ethyl)-12(H)-quino[3,4-b][1,4]benzothiazine check details (7b) Yield 56 %; an oil; 1H NMR (CDCl3, 500 MHz) δ (ppm): 1.22–1.42 (m, 6H, Hpiperidyl), 2.18–2.35 (m, 4H, Hpiperidyl), 2.48–2.67 (t, J = 7.1 Hz, 2H, NpiperidylCH2), 4.12–4.24 (t, J = 7.1 Hz, 2H, CH2), 6.85–6.88 (m, 1H, H-8), 6.89–6.95 (m, 1H, H-10), 7.12–7.18 (m, 1H, H-11), 7.48–7.54 (m, 1H, H-2), 7.58–7.64 (m, 1H, H-3), 7.98–8.04 (m, 2H, H-1, H-4), 8.48 (s, 1H, H-6); EI-MS m/z: 379 (M+, 100 %); Anal. calcd. for C22H22FN3S: C, 69.63; H, 5.84; N, 11.07; S, 8.45. Found: C, 69.51; H, 5.79; N, 11.00; S, 8.41. 9-Methyl-12-(2-(N-piperidyl)ethyl)-12(H)-quino[3,4-b][1,4]benzothiazine

(7c) Yield 52 %; an oil; 1H NMR (CDCl3, 500 MHz) δ (ppm): 1.24–1.43 (m, 6H, Hpiperidyl), MYO10 2.20–2.34 (m, 7H, CH3, Hpiperidyl), 2.54–2.61 (t, J = 7.3 Hz, 2H, NpiperidylCH2), 4.17–4.23 (t, J = 7.3 Hz, 2H, CH2), 6.92–6.97 (d, 4J = 1.1 Hz, 1H, H-8), 6.98–7.02 (d.d, 3J = 8.2 Hz, 4J = 1.1 Hz, 1H, H-10), 7.06–7.09 (d, 3J = 8.2 Hz, 1H, H-11), 7.46–7.51 (m, 1H, H-2), 7.57–7.62 (m, 1H, H-3), 7.98–8.0 (m, 2H, H-1,H-4)), 8.48 (s, 1H, H-6); EI-MS m/z: 376 (M+, 100 %); Anal. calcd for C23H25N3S: C, 73.56; H, 6.71; N, 11.19; S, 8.54.

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