反应详情

To a suspension of 2-bromo-4-(1,1-dimethylethyl)thiazole (6 g, 27.3 mmol), methyl 3-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoate (9.78 g, 35.4 mmol), and potassium carbonate (11.30 g, 82 mmol) in 1,4-dioxane (20 mL) and water (5 mL), was added 1,1′-bis(diphenylphosphino)ferrocene-palladium(II)dichloride dichloromethane complex (1.113 g, 1.363 mmol). It was degassed and refilled with nitrogen, and was heated to reflux for 1 hour to see complete conversion of the 2-bromothiazole, by LCMS. It was distributed between water (50 mL) and ethyl acetate (200 mL). The organic layer was collected, dried over sodium sulfate, filtered and the filtrate concentrated. The crude isolate was purified on silica gel, eluting with 30% of ethyl acetate in hexanes, to get methyl 4-(4-tert-butylthiazol-2-yl)-3-methylbenzoate as a white solid (7.3 g, 93% yield). LCMS (M+H)+: 290.1. 1H NMR (CDCl3, 500 MHz): δ 8.00 (s, 1H), 7.93 (d, J=8.5 Hz, 1H), 7.83 (d, J=8.5 Hz, 1H), 7.02 (s, 1H), 3.97 (s, 3H), 2.70 (s, 3H), 1.43 (s, 9H).

1. additionwas added 1,1′-bis(diphenylphosphino)ferrocene-palladium(II)dichloride dichloromethane complex (1.113 g, 1.363 mmol)
2. customIt was degassed
3. additionrefilled with nitrogen
4. temperaturewas heated
5. temperatureto reflux for 1 hour
6. customThe organic layer was collected
7. dry with materialdried over sodium sulfate
8. filtrationfiltered
9. concentrationthe filtrate concentrated
10. customThe crude isolate
11. customwas purified on silica gel
12. washeluting with 30% of ethyl acetate in hexanes