Ethyl 4-(4-[(4-bromophenyl)methylene]amino-2-fluorophenyl)piperazine-1-carboxylate (4c) The mixture of ARS-1620 supplier compound 3 (10 mmol) and 4-bromobenzaldehyde (10 mmol) in absolute ethanol was irradiated at 150 W and 150 °C for 30 min. The yellow solid obtained was recrystallized ethanol. Yield: 84 %, M.p: 124–126 °C.

FT-IR (KBr, ν, cm−1): 3053 (ar–CH), 1671 (C=O), 1434 (C=N), 1210 (C–O). ISRIB clinical trial Elemental analysis for C20H21BrFN3O2 calculated (%): C, 55.31; H, 4.87; N, 9.68. Found (%): C, 55.71; H, 4.90; N, 9.79. 1H NMR (DMSO-d 6, δ ppm): 1.19 (t, 3H, CH3, J = 7.0 Hz), 2.98 (s, 4H, 2CH2), 3.51 (s, 4H, 2CH2), 4.05 (q, 2H, CH2, J = 7.0 Hz), 6.93–7.27 (m, 3H, arH), 7.71 (d, 2H, arH, J = 7.8 Hz), 7.84 (d, 2H, arH, J = 8.2 Hz), 8.65 (s, 1H, N=CH). 13C NMR (DMSO-d 6, δ ppm): 15.26 (CH3), 41.40 (CH2), 44.04 (CH2), 50.78 (2CH2), 61.56 (CH2), arC: [105.00 (CH), 109.44 (d, CH, J C–F = 22.5 Hz), 119.80 (d, CH, J C–F = 58.2 Hz), 125.61 (C), 131.05 (2CH), 132.57

(2CH), 135.83 (C), 138.83 (d, C, J C–F = 8.75 Hz), 146.26 (d, C, J C–F = 8.5 Hz), 153.39 (C)], 155.27 (C=O), 159.44 (N=CH). Ethyl 4-2-fluoro-4-[(2-hydroxybenzylidene)amino]phenylpiperazine-1-carboxylate (4d) The solution of compound 3 (10 mmol) in absolute ethanol was refluxed with 2-hydroxybenzaldehyde (10 mmol) for 7 h. On cooling the reaction content to room temperature, a solid appeared. This crude product was filtered off and recrystallized from acetone. Yield: 83 %. M.p: 136–137 °C. find more FT-IR (KBr, ν, cm−1):1697 (C=O), 1510 (C=N), 1225 (C–O). Elemental analysis for C20H22FN3O3 calculated (%): C, 64.68; H, 5.97; N, 11.31. Found (%): C: 64.31; H: 5.78; N: 11.48. 1H NMR (DMSO-d learn more 6, δ ppm): 1.21 (brs, 3H, CH3), 3.00 (s, 4H, 2CH2), 3.52 (s, 4H, 2CH2), 4.06 (brs, 2H, CH2), 6.97–7.59 (m, 7H, arH), 8.95 (s, 1H, N=CH), 13.02 (s, 1H, OH). 13C NMR (DMSO-d 6, δ ppm): 15.26 (CH3), 44.40 (2CH2), 50.66 (2CH2),

61.59 (CH2), arC: [109.50 (d, CH, J C–F = 22.0 Hz), 117.24 (2CH), 119.33 (CH), 119.87 (C), 120.22 (d, CH, J C–F = 28.5 Hz), 133.18 (CH), 133.86 (CH), 139.28 (d, C, J C–F = 9.0 Hz), 143.26 (d, C, J C–F = 8.5 Hz), 153.32 (C), 156.74 (d, C, J C–F = 145.5 Hz)], 160.82 (C=O), 163.17 (N=CH). Ethyl 4-(2-fluoro-4-[(4-methoxyphenyl)methylene]aminophenyl)piperazine-1-carboxylate (4e) The solution of compound 3 (10 mmol) in absolute ethanol was refluxed with 4-methoxybenzaldehyde (10 mmol) for 7 h. On cooling the reaction content to room temperature, a solid appeared.