反应详情

In a 5 L, 3-neck round-bottom flask, (Z)-isopropyl 3-(3-(3,5-bis(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)acrylate (130 g, 1.0 eq.) was dissolved in THF (1.3 L). A solution of LiOH (69.3 g, 5.0 eq.) in water (1.3 L) was added dropwise to the solution and the reaction mixture was stirred at RT for 4 h before being quenched with 400 mL ice-water slurry and made acidic (pH=2-3) with dilute aqueous HCl. The mixture was extracted with EtOAc (3×1 L) and the combined organic layers were washed with aqueous saturated sodium chloride solution, dried over anhydrous Na2SO4, and concentrated under reduced pressure to afford 110 g of (Z)-3-(3-(3,5-bis(trifluoromethyl)phenyl)-1H-1,2,4-triazol-1-yl)acrylic acid (yield: 94%), (cis content=90.0%, trans content=8.2% by LCMS).

1. custombefore being quenched with 400 mL ice-water slurry
2. extractionThe mixture was extracted with EtOAc (3×1 L)
3. washthe combined organic layers were washed with aqueous saturated sodium chloride solution
4. dry with materialdried over anhydrous Na2SO4
5. concentrationconcentrated under reduced pressure