3.2.1. 1-Methyl-3-(3-oxo-1,3-diphenylpropyl)indolin-2-one (**4**)

32% Yield; white solid; mp = 122.9–125.6 ◦C; *<sup>R</sup>*<sup>f</sup> = 0.24 (silica gel, hexane:EtOAc = 4:1); 1H NMR (500 MHz, CDCl3): *<sup>δ</sup>* 8.09–8.01 (m, 2H), 7.57 (td, *<sup>J</sup>* = 7.4, 1.2 Hz 1H), 7.47 (dd, *J* = 10.6, 4.7 Hz, 2H), 7.33 (d, *J* = 7.3 Hz, 1H), 7.17 (t, *J* = 7.7 Hz, 1H), 7.11–7.05 (m, 5H), 7.03 (td, *J* = 7.7, 0.7 Hz, 1H), 6.57 (d, *J* = 7.7 Hz, 1H), 4.33–4.17 (m, 2H), 3.84 (d, *J* = 3.6 Hz, 1H), 3.54 (dd, *J* = 17.0, 5.1 Hz, 1H), 2.99 (s, 3H) ppm; 13C NMR (125 MHz, CDCl3) *δ* 199.1, 176.6, 144.1, 139.6, 137.2, 133.3, 128.7, 128.3, 127.98, 127.96, 127.8, 126.9, 124.4, 122.3, 107.8, 49.8, 42.2, 39.7, 25.9 ppm; HRMS (EI): calcd for C24H21NO2 [M+] : 355.1572, found 355.1573.
