反应详情

To a stirred solution of 6-hydroxy-1′-(4-methoxybenzyl)-2′-oxo-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-5-carbonitrile (0.84 g, 2.10 mmol) and hydroxylamine hydrochloride (0.20 g, 2.9 mmol) in ethanol (50 mL) was added triethylamine (0.40 mL, 2.9 mmol). The reaction mixture was stirred at reflux for 18 h and concentrated in vacuo. The residue was extracted with ethyl acetate (3×50 mL). The combined organic extracts were washed with water and brine, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo to afford N′,6-dihydroxy-1′-(4-methoxybenzyl)-2′-oxo-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-5-carboximidamide (0.90 g, 99%): MS (ES+) m/z 431.9 (M+1).

1. temperatureat reflux for 18 h
2. concentrationconcentrated in vacuo
3. extractionThe residue was extracted with ethyl acetate (3×50 mL)
4. washThe combined organic extracts were washed with water and brine
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationfiltered
7. concentrationThe filtrate was concentrated in vacuo