1-Chloro-3-methyl-2-butene → HCID 53672322, compound

Participants

Reaction Steps

80 Grams of the mixture of 5-allyl-6-allyloxy-3,4-dihydro-2(1H)-quinolinone and 7-allyl-6-allyloxy-3,4-dihydro-2(1H)-quinolinone obtained in Example 16 was dissolved in 300 ml of dimethylformamide, then 15 g of 60% oily sodium hydride was added little by little thereto at room temperature and stirred at 25° to 40° C. until generation of hydrogen gas was ceased. After the reaction mixture was cooled to room temperature, 35 g of prenyl chloride was added thereto and stirred at 50° C. for 2 hours, further stirred at room temperature for 8 hours. After finished the reaction, the dimethylformamide was removed by distillation under reduced pressure to obtain the residue. To the residue was added water and extracted with ethyl acetate. The extract was washed with water and an aqueous solution saturated with sodium chloride, then dried with anhydrous magnesium sulfate. The magnesium sulfate was removed by filtration, and the filtrate was concentrated to obtain pale yellow oily product. This oily product was subjected to separation and purification by means of a silica gel flush chromatography, by using a mixed solvent of ethyl acetate:n-hexane (1:10 to 1:2) as the eluent, there was obtained 29 g (28.3%) of 6-allyloxy-3,4-dihydro-1-prenyl-7-(1-propenyl)-2(1H)-quinolinone.

Provenance & Evidence