反应详情

To tetrahydrofuran (15 mL) at about −10° C. stirred under a nitrogen atmosphere were added diethyl azodicarboxylate (0.66 mL, 4.18 mmol), 5-hydroxy-3-[3-(trifluoromethyl)phenyl]-4-thiazolidinone (1 g, 3.8mmol), 3-(1,1-dimethylethyl)-1H-pyrazole (0.48 g, 3.8 mmol) and triphenylphosphine (1.2 g, 4.41 mmol). After the addition, the reaction mixture was allowed to warm up to room temperature, and stirred overnight under a nitrogen atmosphere. The reaction mixture was concentrated, and the residue taken into a small amount of methylene chloride and then filtered. The filtrate was loaded on silica gel in a medium pressure liquid chromatography column and eluted with a solution of 20% ethyl acetate and 80% hexanes followed by a solution of 33% ethyl acetate and 67% hexanes to give 0.26 g of a crude product. The crude product was further purified by medium pressure liquid chromatography (silica gel, 9% ethyl acetate/91% hexanes) to afford the title compound, a compound of this invention, as a viscous oil (130 mg).

1. additionAfter the addition
2. concentrationThe reaction mixture was concentrated
3. filtrationfiltered
4. washeluted with a solution of 20% ethyl acetate and 80% hexanes
5. customto give 0.26 g of a crude product
6. customThe crude product was further purified by medium pressure liquid chromatography (silica gel, 9% ethyl acetate/91% hexanes)