3.2.6. (Z)-1-Methyl-3-(1-(4-nitrophenyl)ethylidene)indolin-2-one (**(***Z***)-5c**)

86% Yield; orange solid; mp = 189.8–192.2 ◦C; *<sup>R</sup>*<sup>f</sup> = 0.26 (silica gel, hexane:EtOAc = 3:1); 1H NMR (500 MHz, CDCl3): *<sup>δ</sup>* 8.28 (d, *<sup>J</sup>* = 8.5 Hz, 2H), 7.67 (d, *<sup>J</sup>* = 7.6 Hz, 1H), 7.44 (d, *<sup>J</sup>* = 8.5 Hz, 2H), 7.35 (t, *J* = 7.8 Hz, 1H), 7.12 (t, *J* = 7.7 Hz, 1H), 6.85 (d, *J* = 7.8 Hz, 1H), 3.14 (s, 3H), 2.63 (s, 3H) ppm; 13C NMR (125 MHz, CDCl3) *δ* 166.2, 149.8, 149.1, 147.4, 143.8, 129.5, 128.4, 125.1, 124.3, 123.8, 122.8, 122.3, 108.3, 25.9, 24.8 ppm; HRMS (EI): calcd for C17H14N2O3 [M+] : 294.1004, found 294.1001.
