反应详情

温度

-20 °C

A solution of 3-hydroxy-4-methoxybenzoic acid (0.5 g, 3 mmol) in dichloromethane and dimethylformamide was cooled to −20° C., and N-bromosuccinimide (0.57 g, 3.2 mmol) and triphenylphosphine (0.8 g, 3.1 mmol) were added in one portion. The mixture was stirred at −20° C. for 10 min, and treated with a solution of 4-aminobiphenyl (0.5 g, 3 mmol) and dry pyridine (0.3 g, 3.8 mmol) in dichloromethane (5 mL). The mixture was allowed to warm to RT, stirred 20 h, concentrated in vacuo, and the residue was stirred in 5% methanol/dichloromethane (40 mL) and filtered. The filtrate was concentrated in vacuo, chromatographed (silica gel, 5% methanol/dichloromethane), and fractions containing the product were pooled, concentrated in vacuo, and dissolved in dichloromethane from which the title compound precipitated (0.11 g): MS(ES) m/e 320 [M+H]+.

1. temperatureto warm to RT
2. stirringstirred 20 h
3. concentrationconcentrated in vacuo
4. stirringthe residue was stirred in 5% methanol/dichloromethane (40 mL)
5. filtrationfiltered
6. concentrationThe filtrate was concentrated in vacuo
7. customchromatographed (silica gel, 5% methanol/dichloromethane), and fractions
8. additioncontaining the product
9. concentrationconcentrated in vacuo
10. dissolutiondissolved in dichloromethane from which the title compound
11. customprecipitated (0.11 g)