反应详情

温度

0 °C

To a suspension of sodium hydride (72 mg, 1.75 mmol, 60% wt) in tetrahydrofuran (1 mL) cooled to 0° C. was added nitroethane (125 μL, 1.75 mmol). The suspension was allowed to warm to room temperature and was stirred for 15 minutes, then cooled back to 0° C. To the suspension was added dropwise a solution of 1,1-dimethylethyl 3-oxoazetidine-1-carboxylate (300 mg, 1.75 mmol, in 2 mL of tetrahydrofuran), prepared using procedures similar to those described in Reference 3. The suspension was stirred at room temperature for 1 hour. The reaction mixture was quenched by adding 20% aqueous citric acid, and then was partitioned with ethyl acetate. The aqueous portion was extracted twice using ethyl acetate and the combined organic portion was washed with saturated sodium bicarbonate, brine, dried over sodium sulfate, filtered and concentrated in vacuo to afford a colorless oil that was purified by column chromatography. Eluting with 30% ethyl acetate in hexanes, the isolated product was concentrated in vacuo to afford 250 mg, 1.02 mmol (58%) of 1,1-dimethylethyl 3-hydroxy-3-(1-nitroethyl)azetidine-1-carboxylate as a colorless oil. 1H NMR (400 MHz, DMSO): 6.46 (s, 1H), 5.01 (q, 1H), 4.24-3.97 (m, 2H), 3.77-3.60 (m, 2H), 1.41 (d, 3H), 1.39 (s, 9H).

1. temperatureto warm to room temperature
2. temperaturecooled back to 0° C
3. customprepared
4. stirringThe suspension was stirred at room temperature for 1 hour
5. customThe reaction mixture was quenched
6. additionby adding 20% aqueous citric acid
7. customwas partitioned with ethyl acetate
8. extractionThe aqueous portion was extracted twice using ethyl acetate
9. washthe combined organic portion was washed with saturated sodium bicarbonate, brine
10. dry with materialdried over sodium sulfate
11. filtrationfiltered
12. concentrationconcentrated in vacuo
13. customto afford a colorless oil that
14. customwas purified by column chromatography
15. washEluting with 30% ethyl acetate in hexanes
16. concentrationthe isolated product was concentrated in vacuo