反应详情

To a suspension of 2-acetoxymethyl-7-chloro-6-methyl-3,4-dihydroquinazolin-4-one (2.00 g, 7.5 mmol) in anhydrous carbon tetrachloride (120 ml) was added N-bromosuccinimide (1.47 g, 8.3 mmol) followed by dibenzoyl peroxide (7.0 mg) under argon. The reaction mixture was placed in a preheated oil bath at 120° C. and stirred at this temperature for 3.5 hours while illuminating. The solvent was removed in vacuo and the residue was twice purified by column chromatography using 40% ethyl acetate in chloroform as eluant (1.02 g, 40%), mp 190-195° C., 1H-NMR (DMSO-d6) 2.14 (s, 3H, CH3CO), 4.91, 4.97 (2×s, 4H, 2-CH2 and 6-CH2), 7.78 (s, 1H, 8-H), 8.36 (s, 1H, 5-H), 12.61 (s, 1H, N3—H). This product was used in the next experiment without any further purification.

1. customThe reaction mixture was placed in a preheated oil bath at 120° C.
2. customwhile illuminating
3. customThe solvent was removed in vacuo
4. customthe residue was twice purified by column chromatography
5. customThis product was used in the next experiment without any further purification