*5-(4-(dimethylamino)phenyl)-3-(4-fluorophenyl)-4,5-dihydro-1H-pyrazole-1-carbaldehyde (***3j***)*

Mp = 168–171 ◦C; Rf = 0.13; 1H NMR (300 MHz, ppm, DMSO-*d*6): 8.86 (s, 1H, −CHO); 7.86–7.83 (m, 2H, arom.), 7.33–7.30 (m, 2H, arom.), 7.05–7.04 (d, 2H, arom.), 6.68–6.66 (d, 2H, arom.), 5.43–5.40 (m, 1H, CH-pyr.), 3.87–3.82 (m, 1H, −CH2-pyr.), 3.19–3.16 (m, 1H, CH2-pyr.), 2.86 (s, 6H, 2CH3); 13C NMR (DMSO-*d*6) δ (ppm): 164.2, 162.5, 159.4, 155.1, 149.9, 129.0, 128.9, 128.7, 127.5, 126.5, 115.9, 115.8, 112.4, 58.3, 42.2, 40.1; *m*/*z* calcd for [C18H18FN3O]+ ([M+H]+/M++H+Na): 311.35, found 312.30/334.
