反应详情

温度

0 °C

An aqueous solution (10 ml) of sodium nitrite (7.32 g) was added dropwise to a concentrated hydrochloric acid solution (90 ml) of 4-aminothiazole-5-carboxylic acid methyl ester (15.3 g) at 0-10° C. The mixture was then stirred at 0° C. for 30 minutes. To this mixture there was added dropwise a concentrated hydrochloric acid solution (100 ml) containing tin(II) chloride (73.2 g) at 0-10° C., and the mixture was stirred at the same temperature for 2 hours. The mixture was filtered and the filtrate was carefully added to a suspension of potassium carbonate and Celite in ethyl acetate (3 l) while stirring, with regular addition of potassium carbonate to prevent solution acidity. After adding the filtered substance to this ethyl acetate suspension, it was rendered basic with a 5N aqueous sodium hydroxide solution. The mixture was allowed to stand, and then most of the supernatant (organic layer A) was separated off. The remaining suspension was filtered through Celite and the filtrate was separated into organic layer B and aqueous layer A. Ethyl acetate (500 ml) and anhydrous magnesium sulfate were added to the filtered substance, and the mixture was stirred and then filtered. Aqueous layer A was re-extracted with the resulting filtrate. Washing of the filtered substance and re-extraction of aqueous layer A were repeated 4 times in the same manner. Organic layer A and organic layer B were combined with the obtained organic layer, and the mixture was dried over anhydrous magnesium sulfate. The desiccant was filtered out and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate-methanol system) to obtain the target compound (11.6 g) as an off-white solid.

1. stirringthe mixture was stirred at the same temperature for 2 hours
2. filtrationThe mixture was filtered
3. additionthe filtrate was carefully added to a suspension of potassium carbonate and Celite in ethyl acetate (3 l)
4. stirringwhile stirring, with regular addition of potassium carbonate
5. additionAfter adding the filtered substance to this ethyl acetate suspension, it
6. custommost of the supernatant (organic layer A) was separated off
7. filtrationThe remaining suspension was filtered through Celite
8. customthe filtrate was separated into organic layer B and aqueous layer A
9. additionEthyl acetate (500 ml) and anhydrous magnesium sulfate were added to the filtered substance
10. stirringthe mixture was stirred
11. filtrationfiltered
12. extractionAqueous layer A was re-extracted with the resulting filtrate
13. washWashing of the filtered substance and re-extraction of aqueous layer A
14. dry with materialthe mixture was dried over anhydrous magnesium sulfate
15. filtrationThe desiccant was filtered out
16. concentrationthe filtrate was concentrated under reduced pressure
17. customThe residue was purified by silica gel column chromatography (ethyl acetate-methanol system)