反应详情

3-(4-nitrobenzyl)-thiazolidine (1.1 g, 5 mmoles) is put into solution in 10 ml concentrated hydrochloric acid at 0° C. Dihydrated in chloride (7.7g, 34 mmoles) is added in portions, the mixture is heated for 2 hours under reflux and the acid is evaporated off under reduced pressure. The residue is then taken up in 20 ml of water and. neutralized with a 2N soda solution (approximately 100 ml). 100 ml of dichloromethane is added to the medium and the whole is filtered on celite in order to eliminate the salts in suspension. The organic phase is extracted, washed 3 times with 50 ml of water, dried, filtered and evaporated to dryness under reduced pressure. The expected product is purified on silica gel in a dichloromethane/methanol (98/2) mixture and is obtained in the form of of a beige powder (0.6 g, 63%). Melting point: 73-74° C.

1. additionis added in portions
2. temperaturethe mixture is heated for 2 hours
3. temperatureunder reflux
4. customthe acid is evaporated off under reduced pressure
5. addition100 ml of dichloromethane is added to the medium
6. filtrationthe whole is filtered on celite in order
7. extractionThe organic phase is extracted
8. washwashed 3 times with 50 ml of water
9. customdried
10. filtrationfiltered
11. customevaporated to dryness under reduced pressure
12. customThe expected product is purified on silica gel in a dichloromethane/methanol (98/2) mixture