反应详情

10 g (34.8 mmol) of 5-amino-1-(2-fluorobenzyl)-3-(5-hydroxymethyl-2-furyl)-pyrazole are initially introduced in a mixture of 66 ml of ethanol and 26.7 ml of 5% strength aqueous hydrochloric acid, treated in the course of 5 minutes with 26.4 ml of a 15% strength ethanolic solution of ethyl nitrite and stirred at room temperature for 1 h. The deep violet reaction solution is added to aqueous potassium carbonate solution and extracted with ethyl acetate. After evaporating the organic phase in vacuo, 8 g of the residue are obtained, which can be immediately reacted further. (Rf=0.17, T1E1, SiO2).

1. extractionextracted with ethyl acetate
2. customAfter evaporating the organic phase in vacuo, 8 g of the residue
3. customare obtained
4. customwhich can be immediately reacted further