反应详情

温度

110 °C

A suspension of the 2-iodo-3-methylbenzoic acid ethyl ester (289) (2.9 g-0.01 mol) and 2-methyl-1-propenylboronic acid pinacol ester (3.64 g-0.02 mol-2 eq) in dry DMF (50 mL) and saturated NaHCO3 (10 mL) is degassed for 10 minutes and then treated with tetrakis(triphenylphosphine)palladium(0) (400 mg). The mixture is stirred at 110° C. overnight. The reaction is cooled and the DMF removed in vacuo and the residue diluted with water (120 mL). The aqueous is filtered through hyflo and extracted with EtOAc (3×75 mL). The organic extracts are washed with water (2×50 mL) and brine (2×50 mL), and dried over MgSO4. The organic extracts are concentrated in vacuo and purified by flash chromatography (400 g silica gel, 5% EtOAc in heptane) to give the product as pale yellow oil (1.85 g, 85%).

1. customis degassed for 10 minutes
2. additiontreated with tetrakis(triphenylphosphine)palladium(0) (400 mg)
3. temperatureThe reaction is cooled
4. customthe DMF removed in vacuo
5. additionthe residue diluted with water (120 mL)
6. filtrationThe aqueous is filtered through hyflo
7. extractionextracted with EtOAc (3×75 mL)
8. washThe organic extracts are washed with water (2×50 mL) and brine (2×50 mL)
9. dry with materialdried over MgSO4
10. concentrationThe organic extracts are concentrated in vacuo
11. custompurified by flash chromatography (400 g silica gel, 5% EtOAc in heptane)