反应详情

温度

60 °C

In a mixed solvent of 250 ml of toluene and 50 ml of ethanol were dissolved 20 g of ethyl 2-chloroisonicotinate and 20 g of 2-methyl-4-fluorophenylboronic acid, and 5.8 g of palladium tetrakistriphenylphosphine and 250 ml of a 2M aqueous sodium carbonate solution, and the mixture was stirred at 50 to 70° C. for 2 hours. The solution was cooled down to room temperature and extracted by adding ethyl acetate and water. The organic layer was further washed with water, and dried over magnesium sulfate and concentrated. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=6:1), to give 24.8 g of 4-ethoxycarbonyl-2-(4-fluoro-2-methylphenyl)pyridine as shown in Table 132 below.

1. temperatureThe solution was cooled down to room temperature
2. extractionextracted
3. additionby adding ethyl acetate and water
4. washThe organic layer was further washed with water
5. dry with materialdried over magnesium sulfate
6. concentrationconcentrated
7. customThe residue was purified by silica gel column chromatography (hexane:ethyl acetate=6:1)