反应详情

The 5-methyl-3-(4-nitrophenoxymethyl)isoxazole (3, X═H) (2.59 g, 11.07 mmol) was dissolved in MeOH:CH2Cl2 (1:1, 600 mL). An aqueous solution of (77 mL) sodium hydrosulfite (11.93 g, 68.5 mmol) and K2CO3 (9.55 g, 69 mmol) was added dropwise under nitrogen for 30 min. The reaction was allowed to stir at room temperature for 2 h, and the organic solvents were removed under reduced pressure, diluted with water (200 mL), extracted with CH2Cl2 (3×300 mL), dried over anhydrous Na2SO4 and solvent was removed under reduced pressure. The resulting product was finally dried under high vacuum to afford 1.03 g (46%) of the 5-methyl-3-(4-aminophenoxymethyl)isoxazole (4, X═H). 1H NMR (CDCl3): δ 6.78 (d, 2H, J=8.7 Hz), 6.61 (d, 2H, J=8.4 Hz), 6.07 (s, 1H), 5.01 (s, 2H), 3.44 (s, 2H), 2.40 (s, 3H); LCMS (m/z): 205 (MH+).

1. customthe organic solvents were removed under reduced pressure
2. additiondiluted with water (200 mL)
3. extractionextracted with CH2Cl2 (3×300 mL)
4. dry with materialdried over anhydrous Na2SO4 and solvent
5. customwas removed under reduced pressure
6. customThe resulting product was finally dried under high vacuum