反应详情

温度

-78 °C

DMSO was added dropwise to a solution of (47.5 mL) oxalyl chloride (7.5 mL, 15.0 mmol, 2.0 M in methylene chloride) and the resultant reaction mixture was stirred for 10 min at −78° C. 2,6-Dichlorobenzyloxyethanol (2211 mg, 10 mmol) in dry methylene chloride (5 mL) was added dropwise to the mixture and the mixture was then stirred for 15 minutes under a nitrogen atmosphere at −78° C. Triethylamine (8.4 mL, 60 mmol) was added dropwise to the reaction mixture, and the resultant mixture was stirred for 10 min at −78° C., then allowed to warm to 0° C. (over a period of approximately 20 min). A methylene chloride solution of tert-butyl 3-nitropropionate (1927 mg, 11.0 mmol in 5 mL of dry methylene chloride) was added dropwise to the reaction mixture and the mixture was stirred for 1 hour. The residue was extracted with ether and the resultant white solid was collected by filtration. The organic filtrate was washed with 5% KHSO4 solution (2×) and brine, dried over sodium sulfate, and concentrated to give a crude oil (3.95 g). The oil was subjected to flash chromatography on silica gel with ethyl acetate/hexanes (1:2) to afford the title product as a yellow oil (2.917 g, 74%). TLC: (ethyl acetate, hexanes, 60/40): Rf=0.54.

1. customthe resultant reaction mixture
2. stirringthe mixture was then stirred for 15 minutes under a nitrogen atmosphere at −78° C
3. temperatureto warm to 0° C. (over a period of approximately 20 min)
4. stirringthe mixture was stirred for 1 hour
5. extractionThe residue was extracted with ether
6. filtrationthe resultant white solid was collected by filtration
7. washThe organic filtrate was washed with 5% KHSO4 solution (2×) and brine
8. dry with materialdried over sodium sulfate
9. concentrationconcentrated
10. customto give a crude oil (3.95 g)