反应详情

A mixture of 143 mg of (p-hydroxyphenyl)propiolonitrile, 218 mg of trans-4-pentylcyclohexanecarboxylic acid, 227 mg of N,N'-dicyclohexylcarbodiimide and 12.2 mg of 4-(dimethylamino)pyridine in 15 ml of methylene chloride was stirred at room temperature for 105 minutes in a round flask under argon gasification. The yellow heterogeneous mixture was subsequently poured into 30 ml of water and extracted twice with 30 ml of methylene chloride each time. The organic phases were washed in sequence twice with 30 ml of water each time, twice with 30 ml of 5% acetic acid each time and twice with 30 ml of water each time, dried over magnesium sulphate and concentrated. Low-pressure chromatography (0.4 bar) of the residue (383 mg) on silica gel with 3% ethyl acetate/petroleum ether gave 270 mg (84%) of trans-4-pentylcyclohexanecarboxylic acid p-(2-cyanoethynyl)phenyl ester as colourless crystals. A single crystallization from hexane yielded 219 mg of the ester as colourless platelets (purity 99.7%); m.p. (C-N) 76.8° C., cl.p. (N-I) 153.2° C.

1. extractionextracted twice with 30 ml of methylene chloride each time
2. washThe organic phases were washed in sequence twice with 30 ml of water each time
3. dry with materialtwice with 30 ml of 5% acetic acid each time and twice with 30 ml of water each time, dried over magnesium sulphate
4. concentrationconcentrated