3.4.2. (E)-3-((E)-3-(4-Chlorophenyl)-1-phenylallylidene)-1-methylindolin-2-one (**3ab**)

67% Yield; yellow solid; mp = 123.2 ◦C; *R*<sup>f</sup> = 0.44 (silica gel, hexane:EtOAc = 3:1); 1H NMR (500 MHz, CDCl3): *δ* 9.36 (d, *J* = 16 Hz, 1H), 7.57–7.53 (m, 3H), 7.44 (dt, *J* = 13.3, 2.3 Hz, 2H), 7.29–7.26 (m, 4H), 7.10 (td, *J* = 7.7, 1.1 Hz, 1H), 6.75 (d, *J* = 7.7 Hz, 1H), 6.59 (td, *J* = 7.7, 1.0 Hz, 1H), 6.40 (d, *J* = 16.0 Hz, 1H), 5.72 (d, *J* = 7.8 Hz, 1H), 3.30 (s, 3H) ppm; 13C NMR (125 MHz, CDCl3): *δ* 168.1, 150.8, 143.0, 139.9, 137.5, 135.5, 134.8, 129.4, 129.1, 129.0, 128.7, 128.6, 128.5, 128.2, 123.8, 123.3, 123.0, 121.7, 107.7, 25.9 ppm; HRMS (EI): calcd for C24H18ClNO [M+]: 371.1077, found 371.1077.

#### 3.4.3. (E)-1-Methyl-3-((E)-3-(4-nitrophenyl)-1-phenylallylidene)indolin-2-one (**3ac**)

64% Yield; red solid; mp = 183.3–184.7 ◦C; *R*<sup>f</sup> = 0.32 (silica gel, hexane:EtOAc = 8:1); 1H NMR (500 MHz, CDCl3): *δ* 9.52 (d, *J* = 16.0 Hz, 1H), 8.22–8.10 (m, 2H), 7.64 (d, *J* = 8.8 Hz, 2H), 7.61–7.53 (m, 3H), 7.31–7.26 (m, 2H), 7.15 (td, *J* = 7.7, 1.1 Hz, 1H), 6.76 (d, *J* = 7.7 Hz, 1H), 6.62 (td, *J* = 7.7, 0.9 Hz, 1H), 6.46 (d, *J* = 16.0 Hz, 1H), 5.76 (d, *J* = 7.5 Hz, 1H), 3.30 (s, 3H) ppm; 13C NMR (125 MHz, CDCl3): *δ* 168.0, 149.5, 147.5, 143.4, 137.9, 137.0, 131.8, 129.6, 129.3, 128.9, 128.6, 128.3, 124.9, 124.21, 124.16, 123.0, 121.9, 107.9, 25.9 ppm; HRMS (EI): calcd for C24H18N2O3 [M+] : 382.1317, found 382.1316.

## 3.4.4. (E)-3-((E)-3-(4-Methoxyphenyl)-1-phenylallylidene)-1-methylindolin-2-one (**3ad**)

53% Yield; yellow solid; mp = 135.5 ◦C; *R*<sup>f</sup> = 0.2 (silica gel, hexane:EtOAc = 5:1); 1H NMR (500 MHz, CDCl3): *δ* 9.27 (d, *J* = 16.0 Hz, 1H), 7.55–7.52 (m, 3H), 7.48 (d, *J* = 8.7 Hz, 2H), 7.28–7.27 (m, 2H), 7.08 (td, *J* = 7.7, 1.1 Hz, 1H), 6.84 (dt, *J* = 14.3, 2.9 Hz, 2H), 6.75 (d, *J* = 7.7 Hz, 1H), 6.59 (td, *J* = 7.7, 1.0 Hz, 1H), 6.44 (d, *J* = 16 Hz, 1H), 5.70 (d, *J* = 7.7 Hz, 1H), 3.82 (s, 3H), 3.30(s, 3H) ppm; 13C NMR (125 MHz, CDCl3): *δ* 168.2, 160.7, 151.9, 142.7, 141.5, 137.9, 129.9, 129.6, 129.3, 128.7, 128.5, 128.0, 125.7, 123.6, 123.5, 121.5, 114.3, 107.5, 55.5, 25.9 ppm; HRMS (EI): calcd for C25H21NO2 [M+]: 367.1572, found 367.1572.
