反应详情

温度

-40 °C

To a solution of ethyl 4-chloroquinazoline-2-carboxylate 11 (0.6 g, 2.53 mmol) in THF (6 mL) at −40° C. was added dropwise a solution of 4-fluorophenylmagnesium bromide in THF (1 M, 3 mL, 3.0 mmol, 1.2 eq). The reaction mixture was stirred at −40° C. for 4 hrs. The reaction was quenched by addition of 0.5 N HCl (5 mL) and the mixture was extracted with EtOAc (2×10 mL). The combined organic layers were washed with brine, dried over MgSO4, and concentrated. The crude product was purified by silica gel chromatography eluting with EtOAc/hexanes to afford compound 12 as a light yellow solid (440 mg, 60%). 1H NMR (300 MHz, DMSO-d6) δ 7.45-7.40 (m, 2H), 8.07-8.03 (m, 1H), 8.17-8.13 (m, 2H), 8.23 (m, 2H), 8.42 (d, 1H); LC-MS (ESI) m/z: 287 (M+H)+.

1. customThe reaction was quenched by addition of 0.5 N HCl (5 mL)
2. extractionthe mixture was extracted with EtOAc (2×10 mL)
3. washThe combined organic layers were washed with brine
4. dry with materialdried over MgSO4
5. concentrationconcentrated
6. customThe crude product was purified by silica gel chromatography
7. washeluting with EtOAc/hexanes