反应详情

0.6 g of trans-4-(4-tert-butoxycarbonylmethoxycyclohexyl)benzoic acid (1.79 mmol, 1 eq.) is placed in 8 mL of dichloromethane with stirring. 0.7 mL of diisopropylethylamine (4.49 mmol, 2.5 eq.), 0.275 g of hydroxybenzotriazole (1.79 mmol, 1 eq.) and 0.413 g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (2.15 mmol, 1.2 eq.) are successively added, followed, after 10 minutes, by addition of 0.377 g of 5-benzyl-1,3,4-thiadiazol-2-amine (1.97 mmol, 1.1 eq.). After 16 hours, 0.137 g of hydroxybenzotriazole (0.895 mmol, 0.5 eq.) and 0.172 g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (0.17 mmol, 0.5 eq.) are added. After 18 hours, the medium is evaporated, diluted with ethyl acetate and washed three times with brine. The organic phase is dried over sodium sulfate, filtered and evaporated. The residue is chromatographed on silica gel with a gradient of methanol in dichloromethane ranging from 0% to 2%. 0.09 g of tert-butyl trans-{4-[4-(5-benzyl[1.3.4]thiadiazol-2-ylcarbamoyl)phenyl]cyclohexyloxy}acetate is obtained.

1. waitAfter 18 hours
2. customthe medium is evaporated
3. additiondiluted with ethyl acetate
4. washwashed three times with brine
5. dry with materialThe organic phase is dried over sodium sulfate
6. filtrationfiltered
7. customevaporated
8. customThe residue is chromatographed on silica gel with a gradient of methanol in dichloromethane ranging from 0% to 2%