反应详情

2L (4.30 g, 12.4 mmol) was dissolved in 90 mL of methanol/dichloromethane 1/9 ratio. Hydrazine hydrate (1.67 mL, 22.4 mmol) was added and the reaction was stirred at room temperature for 2 h at which time the deprotection was done. The precipitate byproduct was filtered, and the filtrate was concentrated down to an oil and then purified by flash column chromatography, using chloroform/methanol 99/1 ratio to yield (R)—O-((1,4-dioxan-2-yl)methyl)hydroxylamine (2M, 0.915 g, 61.4% yield over 2 steps). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 3.41 (t, J=10.86 Hz, 1H) 3.57-3.71 (m, 4H) 3.71-3.82 (m, 3H) 3.83-3.92 (m, 1H) 5.55 (br. s., 2H).

1. filtrationThe precipitate byproduct was filtered
2. concentrationthe filtrate was concentrated down to an oil
3. custompurified by flash column chromatography