反应详情

温度

100 °C

To an oven-dried glass vial with stir bar was added a mixture of 120 mg (0.449 mmol) of methyl 4-bromo-5-methylthiothiophene-2-carboxylate (as prepared in Example 241, step (a), 41 mg (10 mol %) of tris-(dibenzylidineacetone)dipalladium, 42 mg (15 mol %) of racemic-2,2′-bis(diphenylphosphino)-1,1′-binaphthyl, 205 mg (0.629 mmol) of cesium carbonate and 70 mg (0.56 mmol) of 3-fluoro-4-methylaniline. The vial was transferred to a glove bag, flushed with dry argon and anhydrous toluene (0.9 mL) was added. The vial was capped with a Teflon-lined screw cap and heated at 100° C. for 48 h. To the cooled suspension was added ethyl acetate (4 mL), the mixture filtered (Celite) washing with ethyl acetate (2×2 mL), and the solvents removed in vacuo. The resulting residue was purified by silica gel preparative thin layer chromatography (10% Et2O in hexane) to afford 103 mg (78%) of the title compound as a yellow oil. 1H-NMR (CDCl3, 400 MHz) δ2.22 (d, 3H, J=1.6 Hz), 2.40 (s, 3H), 3.89 (s, 3H), 6.09 (s, 1H), 6.68 (m, 1H), 6.71 (s, 1H), 7.08 (m, 1H), 7.72 (s, 1H).

1. additionwas added
2. customThe vial was transferred to a glove
3. custombag, flushed with dry argon and anhydrous toluene (0.9 mL)
4. additionwas added
5. customThe vial was capped with a Teflon-
6. customcap
7. additionTo the cooled suspension was added ethyl acetate (4 mL)
8. filtrationthe mixture filtered (Celite)
9. washwashing with ethyl acetate (2×2 mL)
10. customthe solvents removed in vacuo
11. customThe resulting residue was purified by silica gel preparative thin layer chromatography (10% Et2O in hexane)