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1 H NMR (200 MHz, DMSO-d6) δ 3.58 (d, 2H, J 5.6 Hz, CH2), 7.10 (brd, 1H, J 8.0 Hz, H-9), 7.21 (ddd, 1H, J 8.0, 8.0, 1.2 Hz, H-7), 7.51 (ddd, 1H, J 8.0, 8.0, 1.6 Hz, H-8), 7.75 (dd, 1H, J 8.0, 1.6 Hz, H-6), 8.57 (t, 1H, J 5.6 Hz, NH-4), 10.37 (s, 1H, NH-1); 13 C NMR (50 MHz, DMSO-d6) δ 49.5, 126.0, 129.0, 130.6, 135.9, 137.4, 142.2, 173.2, 176.2; EIMS m/z (rel. int. %): [M] + 176 (100), 147 (51), 119 (54), 92 (34). The spectroscopic data are in agreement with those reported in the literature. 1-3

Improved Method for Microwave-Assisted Synthesis of Benzodiazepine-2,5-diones from Isatoic Anhydrides Mediated by Glacial Acetic Acid