反应详情

温度

10 °C

In 10.23 g of N,N-dimethylformamide was dissolved 11.45 g of the concentrated solution (pure weight of methyl 2-propylidene-4-chloroacetoacetate: 4.57 g), and cooled to 10° C. To this mixture was added 6.17 g of sodium bromide, and thereafter heated to 22° C. and vigorously stirred at 22±2° C. for 2 hours. The resulting reaction solution was cooled to 5° C. and washed with 20 g of water, followed by being separated into an aqueous and organic layers. The high-performance liquid chromatography analysis of the organic layer indicated that this layer contained 4.66 g of methyl 2-propylidene-4-bromoacetoacetate (82.6% yield, E/Z ratio=52/48) and 9.7% of the starting material methyl 2-propylidene-4-chloroacetoacetate remained.

1. temperatureheated to 22° C.
2. customThe resulting reaction solution
3. temperaturewas cooled to 5° C.
4. washwashed with 20 g of water
5. customby being separated into an aqueous and organic layers