反应详情

To a mixture of methyl 3-{4-[(4-{[(4-formyl-1-phenyl-1H-pyrazol-3-yl)oxy]methyl}phenoxy)methyl]-5-methyl-1,3-oxazol-2-yl}benzoate (0.29 g), tetraethyl methylenediphosphonate (0.18 g) and N,N-dimethylformamide (10 mL) was added sodium hydride (60% in oil, 0.03 g) at room temperature, and the mixture was stirred at the same temperature for 15 hrs. Water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to give an oily substance (0.28 g) from a fraction eluted with ethyl acetate-hexane (8:1, v/v). To a mixture of the oily substance, tetrahydrofuran (2 mL) and methanol (2 mL) was added 1N aqueous sodium hydroxide solution (2 mL), and the mixture was stirred at 60° C. for 1 hr. To the reaction mixture was added dilute hydrochloric acid to acidify the solution, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate and concentrated to give 3-[4-({4-[({4-[(E)-2-(diethoxyphosphoryl)ethenyl]-1-phenyl-1H-pyrazol-3-yl}oxy)methyl]phenoxy}methyl)-5-methyl-1,3-oxazol-2-yl]benzoic acid as colorless crystals (0.23 g, yield 88%). Recrystallization from ethyl acetate-hexane gave colorless prism crystals. melting point: 153-155° C.

1. extractionthe mixture was extracted with ethyl acetate
2. washThe organic layer was washed with saturated brine
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated
5. customto give an oily substance (0.28 g) from a fraction
6. washeluted with ethyl acetate-hexane (8:1
7. additionTo a mixture of the oily substance, tetrahydrofuran (2 mL) and methanol (2 mL)
8. additionwas added 1N aqueous sodium hydroxide solution (2 mL)
9. stirringthe mixture was stirred at 60° C. for 1 hr
10. additionTo the reaction mixture was added dilute hydrochloric acid
11. extractionthe mixture was extracted with ethyl acetate
12. washThe organic layer was washed with saturated brine
13. dry with materialdried over anhydrous magnesium sulfate
14. concentrationconcentrated