反应详情

To a suspension of 5-hydroxy-7-methoxyquinazolin-4(3H)-one (4.395 g, 22.9 mmol) in DMF (50 mL) at 0° C. was added 1.0 M solution of lithium bis(trimethylsilyl)amide in THF (55 mL, 55 mmol). After it was stirred at room temperature for 1 hour, it was cooled again with an ice-water bath and to it was added chloromethyl pivalate (4.14 g, 27.5 mmol). After it was stirred at room temperature for another hour, it was quenched with a solution of AcOH (10 mL) in water (150 mL) and extracted with CH2Cl2. Extracts were dried over MgSO4 and concentrated to afford the (5-hydroxy-7-methoxy-4-oxoquinazolin-3(4H)-yl)methyl pivalate solid (5.674 g, 81%). 1H NMR (300 MHz, CDCl3) δ 11.36 (s, 1H), 8.16 (s, 1H), 6.69 (d, 1H), 6.51 (d, 1H), 5.88 (s, 2H), 3.89 (s, 3H), 1.21 (s, 9H); LC-MS (ESI) m/z 307 (M+H)+.

1. temperatureit was cooled again with an ice-water bath and to it
2. stirringAfter it was stirred at room temperature for another hour
3. customit was quenched with a solution of AcOH (10 mL) in water (150 mL)
4. extractionextracted with CH2Cl2
5. dry with materialExtracts were dried over MgSO4
6. concentrationconcentrated