反应详情

温度

-40 °C

40 g of 2-bromo-3,4-dimethylpyridine dissolved in 50 ml of anhydrous ether are slowly added, with agitation and under a nitrogen atmosphere, to 300 ml of a 0.9 M solution of butyl-lithium in ether cooled to -40° C. The resulting mixture is agitated for 2 hours at this temperature, and 50 g of 3,4,5-trimethoxybenzaldehyde dissolved in 200 ml of anhydrous benzene are added, and the mixture kept at a temperature below -25° C. Agitation is performed for 1 hour at -15° C, and the reaction is continued until ambient temperature is reached. The mixture is poured on to ice and dilute hydrochloric acid, the acid layer is made alkaline with a current of ammonia, while cooling externally with ice. The precipitate is collected by filtration, supplying 62.6 g of (II). Yield 96%. An analysis sample is crystallized from alcohol (m.p. = 104-6° C). Analysis: C17H21NO4. Calculated: C = 67.31, H = 6.98, N = 4.62. Found: C = 67.23, H = 7.33, N = 4.57.

1. additionare added
2. customkept at a temperature below -25° C
3. customis continued until ambient temperature
4. temperaturewhile cooling externally with ice
5. filtrationThe precipitate is collected by filtration
6. customAn analysis sample is crystallized from alcohol (m.p. = 104-6° C)