“…hydroperoxy-3-(hydroxymethyl)indolin-2-one (4 e). Yellow gummy liquid (0.051 g; 84% yield); 1 H NMR (400 MHz, Methanol-d 4 ) δ 7.49 (d, J = 7.4 Hz, 1H), 7.32 (t, J = 7.8 Hz, 1H), 7.10 (t, J = 7.6 Hz, 1H), 6.91 (d, J = 7.8 Hz, 1H), 3.91 (d, J = 11.2 Hz, 1H), 3.78 (d, J = 11.2 Hz, 1H); 13 C{ 1 H} NMR (100 MHz, Methanol-d 4 ) δ 176.5, 142.8, 129.6, 126.9, 125.1, 122.0, 109.6, 87.8, 62.5; FT-IR(ν cm À 1 ) 3407, 2921, 2851, 1733, 1468, 1215, 1049, 760; HRMS (ESI-TOF) m/z: [M + Na] + calcd for C 9 H 9 NNaO 4 ; 218.0429; found 218.0426.3-hydroperoxy-3-(hydroxymethyl)-5-methoxy-1-methylindolin-2-one (4 f).White solid (0.050 g; 86% yield); mp 120-122 °C; 1 H NMR (400 MHz, Methanol-d 4 ) δ 7.05 (d, J = 2.4 Hz, 1H), 6.87-6.77 (m, 2H), 4.54 (s, 1H), 3.78 (d, J = 11.6 Hz, 1H), 3.71 (s, 3H), 3.62 (d, J = 11.4 Hz, 1H), 3.07 (s, 3H);13 C{ 1 H} NMR (100 MHz, Methanol-d 4 ) δ 174.4, 156.4, 137.9, 127.6, 114.0, 112.1, 108.7, 87.8, 62.5, 54.9, 25.1; FT-IR(ν cm À 1 ) 3368, 2917, 1737, 1604, 1681, 1467, 1288, 1035, 769; HRMS (ESI-TOF) m/z: [M + Na] + calcd for C 11 H 13 NNaO 5 ; 262.0691; found 262.0685. 3-hydroperoxy-3-(hydroxymethyl)-1,5,7-trimethylindolin-2one (4 g).…”