7-bromo-3,4-dihydro-1H-quinazolin-2-one

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Following the same procedure adopted for the synthesis of compound 13, reaction of compound 20 with CDI afforded 0.73 g (75%) of compound 16 as an off-white solid, m.p. 218-219° C.; IR (KBr) νmax. cm−1: 3211, 3166 (NH), 3037 (Ar—H), 1693 (C═O), 1610, 1519, 1417 (C═C). 1H NMR (500 MHz, CDCl3) S=1.48 (s, 9H, (CH3)3C); 3.00 (m, 4H, 2CH2); 3.56 (m, 4H, 2CH2); 4.48 (s, 2H, CH2); 6.62 (d, 1H, J=2.5 Hz, H-8); 6.64 (d, 1H, J=8.5 Hz, H-5); 6.74 (dd, 1H, J=2.5, 8.4 Hz, H-6); 7.80 (br.s, 1H, NH); 13C NMR (125.7 MHz, CDCl3) δ=28.65 (CH3)3C), 43.31 (CH2), 43.98 (CH2), 50.63 (CH2), 80.18 (CH3)3C), 115.13 (C-8/C-6), 115.21 (C-8/C-6), 117.59 (C-5), 118.35 (C-5), 130.66 (C-5), 147.20 (C-5), 154.91 (C═O), 155.95 (C═O). Calculated (%) for C17H24N4O3 (332.18); C: 61.43, H: 7.28, N: 16.86. found (%) C: 61.37, H: 7.32, N: 16.80.

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of compound 12 (0.90 g, 4.5 mmol) in THF (10 mL) at room temperature was added CDI (0.80 g, 4.95 mmol), and the reaction was stirred at 80° C. for 6 hr. The mixture was cooled to room temperature, and the solid formed was filtered, washed with diethyl ether to afford 0.73 g (72%) of compound 13 as off-white solid. IR (KBr) νmax. cm−1: 3308, 3158 (NH), 3022 (Ar—H), 1682 (C═O), 1514, 1411 (C═C). 1H NMR (500 MHz, DMSO-d6) δ=5.25 (s, 2H, CH2); 6.82 (d, 1H, J=8.2 Hz, H-5); 7.42 (m, 2H, H-4, H-6); 10.29 (br. s, 1H, NH); 13C NMR (125.7 MHz, DMSO-d6)=66.85 (CH2), 113.70 (C-10), 115.70 (C-8), 121.03 (C-7), 127.52 (C-6), 131.41 (C-5), 135.88 (C-9), 151.42 (C═O). Calculated (%) for C8H7BrN2O (225.97); C: 42.32, H: 3.11, N: 12.34. found (%); C: 42.27, H: 3.16, N: 12.28. The mixture was cooled to room temperature the solid formed was filtered washed with diethyl ether

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Following the same procedure adopted for the synthesis of compound 13, reaction of compound 20 with CDI afforded 0.73 g (75%) of compound 16 as an off-white solid, m.p. 218-219° C.; IR (KBr) νmax. cm−1: 3211, 3166 (NH), 3037 (Ar—H), 1693 (C═O), 1610, 1519, 1417 (C═C). 1H NMR (500 MHz, CDCl3) δ=1.48 (s, 9H, (CH3)3C); 3.00 (m, 4H, 2CH2); 3.56 (m, 4H, 2CH2); 4.48 (s, 2H, CH2); 6.62 (d, 1H, J=2.5 Hz, H-8); 6.64 (d, 1H, J=8.5 Hz, H-5); 6.74 (dd, 1H, J=2.5, 8.4 Hz, H-6); 7.80 (br.s, 1H, NH); 13C NMR (125.7 MHz, CDCl3) δ=28.65 (CH3)3C), 43.31 (CH2), 43.98 (CH2), 50.63 (CH2), 80.18 (CH3)3C), 115.13 (C-8/C-6), 115.21 (C-8/C-6), 117.59 (C-5), 118.35 (C-5), 130.66 (C-5), 147.20 (C-5), 154.91 (C═O), 155.95 (C═O). Calculated (%) for C17H24N4O3 (332.18); C, 61.43; H, 7.28; N, 16.86. found (%) C, 61.37; H, 7.32; N, 16.80.

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of compound 12 (0.90 g, 4.5 mmol) in THF (10 mL) at room temperature was added CDI (0.80 g, 4.95 mmol), and the reaction was stirred at 80° C. for 6 hr. The mixture was cooled to room temperature, and the solid formed was filtered, washed with diethyl ether to afford 0.73 g (72%) of compound 13 as off-white solid. IR (KBr) νmax. cm−1: 3308, 3158 (NH), 3022 (Ar—H), 1682 (C═O), 1514, 1411 (C═C). 1H NMR (500 MHz, DMSO-d6) δ=5.25 (s, 2H, CH2); 6.82 (d, 1H, J=8.2 Hz, H-5); 7.42 (m, 2H, H-4, H-6); 10.29 (br. s, 1H, NH); 13C NMR (125.7 MHz, DMSO-d6) δ=66.85 (CH2), 113.70 (C-10), 115.70 (C-8), 121.03 (C-7), 127.52 (C-6), 131.41 (C-5), 135.88 (C-9), 151.42 (C═O). Calculated (%) for C8H7BrN2O (225.97); C, 42.32; H, 3.11; N, 12.34. found (%); C, 42.27; H, 3.16; N, 12.28. The mixture was cooled to room temperature the solid formed was filtered washed with diethyl ether