1-Benzyl-3-((4-bromobenzylidene)hydrazono)indolin-2-one (**6f**)

Orange solid (68%) mp = 216–217 ◦C. IR (KBr): νmax (cm−1): 2922 (C-H aliphatic), 1720 (C=O), 1602 (C=N). 1H NMR (DMSO-d6, 600 MHz: δ 4.95 (s, 2H, N-CH2-Ph), 6.85 (d, *J* = 7.2, 1H, ArH), 7.05 (t, 1H, ArH), 7.22–7.42 (m, 6H, ArH), 7.76 (d, *J* = 7.8, 2H, ArH), 7.9 (d, *J* = 7.8, 3H, ArH), 8.60 (s, 1H, N=CH) ppm. 13C NMR (DMSO-d6, 150 MHz: δ 163.67, 159.89, 149.91, 145.53, 136.42, 134.18, 132.94, 132.77, 131.15, 129.19, 128.01, 127.70, 126.34, 123.60, 116.26, 110.61 and 43.20 ppm. ESI mass m/z = 418 [M(79Br) + H]<sup>+</sup>, 420 [M(81Br) + H]<sup>+</sup>.

1-Benzyl-3-((2-methyl benzylidene)hydrazono)indolin-2-one (**6g**)

Orange solid (60%) mp = 176–177 ◦C. IR (KBr): νmax (cm−1): 2920 (C-H aliphatic), 1716 (C=O), 1624 (C=N). 1H NMR (DMSO-d6, 600 MHz: δ 2.53 (t, 3H, Ph-CH3), 4.96 (s, 2H, N-CH2-Ph), 7.0 (d, *J* = 7.8, 1H, ArH), 7.07 (t, 1H, ArH), 7.23–7.41 (m, 8H, ArH), 7.45 (t, 1H, ArH), 7.95 (d, *J* = 7.8, 1H, ArH), 8.08 (d, *J* = 7.2, 1H, ArH), 8.85 (s, 1H, N=CH) ppm. 13C NMR (DMSO-d6, 150 MHz: δ 163.80, 159.92, 149.81, 145.45, 139.86, 136.46, 134.04, 132.44, 131.80, 131.72, 129.19, 128.91, 128.07, 128.00, 127.71, 127.09, 123.54, 116.33, 110.59, 43.19 and 19.59 ppm. ESI mass m/z = 354 [M + H]<sup>+</sup>.
