反应详情

温度

0 °C

Scheme 1, steps A and B: Bromoacetyl bromide (1.06 equiv.) is added to a solution of N,O-dimethylhydroxylamine hydrochloride (1.0 equiv.) (Volumes are in mL/g of this compound) in a stirring mixture of water (4 mL/g), toluene (4 mL/g), and K2CO3 (1.15 equiv.) at 0° C. After warming to room temperature over 1 hour, the layers are separated and the aqueous layer is extracted with toluene (2 mL/g). The combined organic layers are concentrated to give the intermediate 2-bromo-N-methoxy-N-methyl-acetamide containing about 20% toluene. 2-Bromo-N-methoxy-N-methyl-acetamide is added to a mixture of allyl alcohol (6.3 equiv) and K2CO3 (2 equiv.) over 3 hours at 30° C. After 2 hours at 30° C., toluene (4 mL/g) is added, the mixture is cooled to 0° C., and filtered. The filter cake is rinsed with cold (0° C.) toluene (2.7 mL/g) and the combined filtrate is washed with a 3 weight % solution of KHSO4 in water (0.6 mL/g). The toluene solution is concentrated while additional toluene (11 mL/g) is added to remove water and allyl alcohol. The concentrated toluene solution is washed with water (0.5 g/g), further concentrated to remove most of the toluene, and then distilled to give the title compound. LC-MS (m/z): 160 (M+H).

1. filtrationfiltered
2. washThe filter cake is rinsed with cold (0° C.) toluene (2.7 mL/g)
3. washthe combined filtrate is washed with a 3 weight % solution of KHSO4 in water (0.6 mL/g)
4. concentrationThe toluene solution is concentrated while additional toluene (11 mL/g)
5. additionis added
6. customto remove water and allyl alcohol
7. washThe concentrated toluene solution is washed with water (0.5 g/g)
8. concentrationfurther concentrated
9. customto remove most of the toluene
10. distillationdistilled