反应详情

0.88 ml of trifluoroacetic acid anhydride and 1.37 ml of pyridine are simultaneously added in drops to 1.15 g of 4,7-dihydroxy-3-(4-hydroxyphenyl)-2-[4-(2-piperidin-1-ylethoxy) -phenyl]-4-(trifluoromethyl)-2,3-dihydro-4H-1-benzopyran in 20 ml of THF. It is stirred for 4 hours at room temperature before 70 ml of ethyl acetate and 20 ml of 10% sodium carbonate solution are added. It is stirred for 20 more minutes at room temperature. The phases are separated, and the aqueous phase is shaken out three times with 40 ml of ethyl acetate. The combined organic phases are washed twice with 20 ml of water, dried on magnesium sulfate and concentrated by evaporation. The product is prepurified on silica gel with dichloromethane/methanol and then purified with HPLC (nucleosil 50-7, dichloromethane/methanol 85:15, 40 ml/min). 590 mg is obtained.

1. additionare added
2. customThe phases are separated
3. stirringthe aqueous phase is shaken out three times with 40 ml of ethyl acetate
4. washThe combined organic phases are washed twice with 20 ml of water
5. customdried on magnesium sulfate
6. concentrationconcentrated by evaporation
7. custompurified with HPLC (nucleosil 50-7, dichloromethane/methanol 85:15, 40 ml/min)
8. custom590 mg is obtained