3.6.1. (E)-3-((E)-1,3-Diphenylallylidene)-1-methylindolin-2-one (**3aa**)

91% Yield; yellow foam; *R*<sup>f</sup> = 0.37 (silica gel, hexane:EtOAc = 2:1); 1H NMR (500 MHz, CDCl3): *δ* 7.57–7.43 (m, 4H), 7.40 (d, *J* = 7.4 Hz, 2H), 7.31 (t, *J* = 7.5 Hz, 2H), 7.27–7.19 (m, 2H), 7.15 (t, *J* = 7.6 Hz, 1H), 6.79 (d, *J* = 7.7 Hz, 1H), 6.66 (t, *J* = 7.6 Hz, 1H), 6.14 (d, *J* = 7.7 Hz, 1H), 4.82 (d, *J* = 9.8 Hz, 1H), 4.50 (s, 1H), 4.42 (dd, *J* = 12.6, 11.0 Hz, 1H), 3.30 (s, 3H), 2.88

(dd, *J* = 12.8, 2.8 Hz, 1H) ppm; 13C NMR (125 MHz, CDCl3): *δ* 169.6, 155.6, 145.5, 142.3, 141.3, 129.6, 129.1, 128.9, 128.7, 128.5, 127.3, 126.5, 126.3, 125.7, 123.0, 122.8, 122.1, 108.0, 73.7, 46.0, 26.2 ppm; HRMS (EI): calcd for C24H21NO2 [M+] : 355.1572, found 355.1568.
