反应详情

3-(pyridin-3-yloxy)-4,5-dihydroisoxazole I-231a and I-231b were prepared in 3 steps according to the following procedures: 5-hydroxynicotinic acid methyl ester is reacted with racemic bromoisoxazole I-75 using Method 5. The resulting methyl ester (1.0 equiv) is dissolved in methanol (0.08 M) after which hydrazine (50 equiv, 50% by weight in water) is added and the reaction is allowed to stir for 14 h. The reaction mixture is then concentrated under vacuum and used directly in the next step. The hydrazide is dissolved in dioxane (0.12 M with respect to hydrazide). N,N-Carbonydiimidazole (1.2 equiv) is added and the reaction is sealed and heated to reflux for 4 h. The reaction is then transferred to a separatory funnel with excess ethyl acetate and water. The organic layer was washed water and brine, drive over sodium sulfate and concentrated under vacuum to provide crude material which was purified using flash silica gel chromatography (gradient methanol/dichloromethane) to provide the desired racemic 1,3,4-oxadiazol-2(3H)-one I-231. These compounds can be separated using chiral HPLC methods known in the art. For example, see chiral HPLC Method disclosed herein. [M+H]+=423.4 m/z. Activity: B

1. additionis added
2. concentrationThe reaction mixture is then concentrated under vacuum
3. dissolutionThe hydrazide is dissolved in dioxane (0.12 M with respect to hydrazide)
4. additionN,N-Carbonydiimidazole (1.2 equiv) is added
5. customthe reaction is sealed
6. temperatureheated
7. temperatureto reflux for 4 h
8. customThe reaction is then transferred to a separatory funnel with excess ethyl acetate and water
9. washThe organic layer was washed water and brine, drive over sodium sulfate
10. concentrationconcentrated under vacuum
11. customto provide crude material which
12. customwas purified