反应详情

3-(t-butoxycarbonyl)thiazolidine-2-carboxylic acid (1 g, 4.3 mmol) and carbonyldiimidazole (0.7 g, 4.3 mmol) are dissolved in THF (10 ml). The mixture is agitated for 1 hour at ambient temperature. 4-nitrobenzylamine (0.81 g, 4.3 mmoles) and triethylamine (0.6 ml. 0.43 g, 4.3 mmoles) in suspension in 10 ml of a THF and DMF mixture (1/1) are added to the preceding solution and the whole is heated under reflux for 5 hours. The solvents are then evaporated off under reduced pressure. The residue is taken up in 25 ml of ethyl acetate and washed 3 times with 15 ml of water. The organic phase is dried and the solvent is evaporated off under reduced pressure. The product obtained is purified on silica gel in a dichloromethane/methanol mixture (95/5). N-(4-nitrobenzyl)-3-(t-butoxycarbonyl)thiazolidine-2-carboxamide is obtained in the form of a pale yellow oil with a yield of 80% (1.25 g).

1. temperaturethe whole is heated
2. temperatureunder reflux for 5 hours
3. customThe solvents are then evaporated off under reduced pressure
4. washwashed 3 times with 15 ml of water
5. customThe organic phase is dried
6. customthe solvent is evaporated off under reduced pressure
7. customThe product obtained
8. customis purified on silica gel in a dichloromethane/methanol mixture (95/5)