反应详情

To a stirred solution of azetidin-3-ylmethyl (2-nitro-5-(thiophen-2-yl)phenyl)carbamate (0.09 g, 0.26 mmol, 1.0 eq.) in CH3CN:CH2Cl2 was added aq. formaldehyde (0.77 mmol, 3.0 eq.). The reaction mixture was stirred at room temperature for 30 min then cooled to 0° C. Sodium cyanoborohydride (0.03 g, 0.46 mmol, 1.8 eq.) was added slowly. The reaction was quenched with an aqueous saturated solution of sodium bicarbonate. The product was extracted with ethyl acetate. The combined organic layers were washed with brine, dried over sodium sulfate and concentrated under reduced pressure. The crude product was purified by column chromatography (silica gel, 5% MeOH/CH2Cl2) to obtain (1-methylazetidin-3-yl)methyl (2-nitro-5-(thiophen-2-yl)phenyl)carbamate (0.07 g, 75% yield).

1. temperaturethen cooled to 0° C
2. customThe reaction was quenched with an aqueous saturated solution of sodium bicarbonate
3. extractionThe product was extracted with ethyl acetate
4. washThe combined organic layers were washed with brine
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe crude product was purified by column chromatography (silica gel, 5% MeOH/CH2Cl2)