反应详情

温度

65 °C

The crude 2-chloro-4-[[(trans-4-heptylcyclohexyl)carbonyl]oxy]benzoic acid p-(chlorocarbonyl)phenyl ester obtained was dissolved in 70 ml of benzene and then added dropwise to a solution of 1.04 g of 3-chloro-4-nitrophenol in 50 ml of pyridine. The reaction mixture was stirred overnight at a bath temperature of 65° C., then poured into ice-cold dilute hydrochloric acid and extracted with diethyl ether. The extract was washed four times with 50 ml of 3N hydrochloric acid each time and once with 50 ml of 2N sodium carbonate solution, washed neutral with water, dried and concentrated. The crude 2-chloro-4-[[(trans-4-heptylcyclohexyl)carbonyl]oxy]benzoic acid p-[(3-chloro-4-nitrophenoxy)carbonyl]phenyl ester (3.2 g) obtained was chromatographed on silica gel with hexane/dioxan (volume ratio 3:1). The fractions which were pure according to thin-layer chromatography (1.8 g) were recrystallized twice from ethyl acetate; m.p. (C-N) 138° C., cl.p. (N-I) 237.5° C.

1. additionpoured into ice-cold dilute hydrochloric acid
2. extractionextracted with diethyl ether
3. washThe extract was washed four times with 50 ml of 3N hydrochloric acid each time
4. washonce with 50 ml of 2N sodium carbonate solution, washed neutral with water
5. customdried
6. concentrationconcentrated