反应详情

4.16 g of 1-tert-butoxycarbonylmethyl-8-methoxy-2-oxo-1,2,3,4-tetrahydroquinolin-5-carboxaldehyde and 1.66 g of 2,4-thiazolidinedione (1.00 eq.) were suspended in 40 ml of toluene, and two drops of acetic acid and two drops of piperidine were added, followed by heating and refluxing for 13 hours using a Dean Stark trap. After cooling, crystals were separated by filtration and washed with toluene. The crystals obtained were suspended in 3.15 g of silica gel, 2.09 g of dihydropyridine, and 60 ml of toluene, followed by heating and refluxing overnight. 3.15 g of silica gel was added, the solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=2:1), and recrystallized from ethyl acetate-hexane, giving 2.13 g (38% yield) of 5-(1-carboxymethyl-8-methoxy-2-oxo-1,2,3,4-tetrahydroquinolin-5-ylmethyl)thiazolidine-2,4-dione as a white powder.

1. temperatureby heating
2. temperaturerefluxing for 13 hours
3. temperatureAfter cooling
4. customcrystals were separated by filtration
5. washwashed with toluene
6. customThe crystals obtained
7. temperatureby heating
8. temperaturerefluxing overnight
9. addition3.15 g of silica gel was added
10. distillationthe solvent was distilled off under reduced pressure
11. customthe residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=2:1)
12. customrecrystallized from ethyl acetate-hexane