Tetrahydrofuran → N-[4-(1,4-Dioxa-8-azaspiro[4.5]dec-8-yl)benzyl]-N-hydroxyurea

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Reaction Steps

Trimethylsilyl isocyanate (2.1 mL, 14.85 mmol) was added dropwise into a mixture of 8-{4-[(hydroxyamino)methyl]phenyl}-1,4-dioxa-8-azaspiro[4.5]decane (2.61 g, 9.9 mmol) (which was obtained in Example 52), THF(20 mL) and dioxane (20 mL). The mixture was stirred at room temperature for 24 hours, poured into water and extracted with ethyl acetate. The organic extracts were dried over MgSO4. Evaporation and purification by flash chromatography (hexanes/ethyl acetate/methyl alcohol 10/5/1) gave a white solid (2.2 g, 73% yield); mp 153–154° C.; 1H NMR (400 MHz, DMSO-d6) δ 1.70 (m, 4H), 3.21 (m, 4H), 3.89 (s, 4H), 4.37 (s, 2H), 6.23 (brs, 2H), 6.86 (m, 2H), 7.10 (m, 2H), 9.19 (s, 1H); MS (ES) m/z: 308 (MH+); Anal. Calcd. for C15H21N3O4: C, 58.62; H, 6.89; N, 13.67. Found: C, 58.37; H, 6.78; N, 13.47

Provenance & Evidence