反应详情

To a solution of 8-bromo-2-chloroquinazolin-4(3H)-one (407c; 0.110 g, 0.424 mmol) in 2 mL DME and 0.5 mL DMF in an ice/water bath was added sodium hydride (60% in mineral oil; Aldrich; 0.019 g, 0.466 mmol). After 10 min, lithium bromide (Aldrich; 0.074 g, 0.848 mmol) was added and the reaction was warmed to RT. After 15 min, (3-bromopropoxy)-tert-butyldimethylsilane (0.108 mL, 0.466 mmol) was added. After 30 min, the reaction was placed in a 60° C. oil bath and heated over the weekend. The reaction was partitioned between water and EtOAc. The aq layer was extracted 2× EtOAc and The combined organic layers were washed with water 2 times, satd aq NaCl once, and the organics were dried over anhydrous Na2SO4, filtered, and concentrated in vacuo. The material was treated with DCM and purified by silica gel chromatography using 0-20% EtOAc/hexane. The product-containing fractions were concentrated to afford 8-bromo-3-(3-((tert-butyldimethylsilyl)oxy)propyl)-2-chloroquinazolin-4(3H)-one (0.080 g, 0.185 mmol, 43% yield) as a yellow oil. 1H NMR (400 MHz, CDCl3) δ ppm 8.21 (1H, dd, J=7.9, 1.3 Hz), 8.02 (1H, dd, J=7.8, 1.4 Hz), 7.34 (1H, t, J=7.8 Hz), 4.38-4.50 (2H, m), 3.78 (2H, t, J=5.8 Hz), 1.96-2.05 (2H, m), 0.89 (9H, s), 0.03-0.08 (6H, m). m/z (ESI, +ve ion) 431.0/433.0/435.0 (M+H)+.

1. waitAfter 15 min
2. waitAfter 30 min
3. customwas placed in a 60° C.
4. temperatureheated over the weekend
5. customThe reaction was partitioned between water and EtOAc
6. extractionThe aq layer was extracted 2× EtOAc
7. washThe combined organic layers were washed with water 2 times
8. dry with materialthe organics were dried over anhydrous Na2SO4
9. filtrationfiltered
10. concentrationconcentrated in vacuo
11. additionThe material was treated with DCM
12. custompurified by silica gel chromatography
13. concentrationThe product-containing fractions were concentrated