反应详情

0.4 g of cis-4-(4-methoxycarbonylcyclohexyloxy)benzoic acid is placed in 10 mL of dichloromethane with stirring, at room temperature, under a nitrogen atmosphere. 0.18 mL of oxalyl chloride (2.16 mmol, 1.5 eq.) and 2 drops of dimethylformamide are successively added. The reaction medium is stirred for 2 hours and concentrated under vacuum. The methyl cis-4-(4-chlorocarbonylphenoxy)cyclohexanecarboxylate formed is dissolved in 15 mL of acetonitrile and placed under nitrogen. The mixture is cooled in an ice bath and 0.210 g of potassium thiocyanate (2.16 mmol, 1.5 eq.) is added. The reaction mixture is stirred at room temperature for 1 hour 30 minutes. 0.455 g of cyclopentyloxyacetic acid hydrazide (2.87 mmol, 2 eq.) dissolved in 5 mL of acetonitrile is then added to the methyl cis-4-(4-isothiocyanatocarbonylphenoxy)cyclohexanecarboxylate obtained and the mixture is refluxed for 2 hours 30 minutes and then left to stand at room temperature for 36 hours. The precipitate formed is filtered off and washed with acetonitrile. 0.450 g of methyl cis-4-[4-(5-cyclopentyloxymethyl[1.3.4]thiadiazol-2-ylcarbamoyl)phenoxy]cyclohexanecarboxylate is obtained.

1. stirringThe reaction medium is stirred for 2 hours
2. concentrationconcentrated under vacuum