反应详情

To a 50-mL round-bottom flask equipped with a magnetic stirbar was added chloromethyl alkoxyamine 3 (1.789 g, 4.784 mmol) and acetone (20 mL). To the resulting solution was added sodium iodide (2.869 g, 19.14 mmol, 4 equiv) and the reaction mixture was capped with a rubber septum and allowed to stir for 24 hours at room temperature. The sodium chloride side product was remove by gravity filtration, and the filtrate was concentrated on a rotary evaporator. The crude oily product was purified by flash chromatography, eluting with hexanes. The desired iodomethyl akoxyamine 4 was obtained as a colorless oil (1.968 g, 88.3% yield). ESI-MS: m/z=466.0, observed; 465.41, calculated. 1H NMR (500 MHz, CDCl3, both diastereomers) δ 7.5-7.1 (m, 18H), 5.35 (t, 2H) 4.90 (q+q, 2H, both diastereomers), 4.55 (s, 4H), 3.55 (m, 2H), 3.40 (d, 1H, minor diastereomer), 3.30 (d, 1H, major diastereomer), 2.40 (m, 2H, both diastereomer), 2.30 (d, 2H), 1.65 (d, 3H, minor diastereomer), 1.58 (d, 3H, major diastereomer), 1.33 (d, 3H, minor diastereomer), 1.05 (s, 9H, major diastereomer), 0.98 (s, 6H), 0.95 (d, 3H, major diastereomer), 0.89 (d, 12H), 0.85 (d, 6H), 0.82 (s, 9H, minor diastereomer), 0.68 (s, 2H), 0.59 (d, 3H, minor diastereomer), 0.28 (d, 3H, major diastereomer).

1. customTo a 50-mL round-bottom flask equipped with a magnetic stirbar
2. customthe reaction mixture was capped with a rubber septum
3. customThe sodium chloride side product was remove by gravity filtration
4. concentrationthe filtrate was concentrated on a rotary evaporator
5. customThe crude oily product was purified by flash chromatography
6. washeluting with hexanes