反应详情

Pyridine (3.24 ml) was dissolved in 120 ml of dichloroethane, followed by addition of 1.10 ml of titanium tetrachloride. The mixture was heated under reflux for 15 minutes. Then, 3.00 g of 2,3,5-trimethyl-1,4-benzoquinone and 2.00 g of 2-aminothiazole were added, and the resultant mixture was heated under reflux for 2 hours. The reaction mixture was cooled to room temperature and filtered through a Celite pad, and the insoluble matter was washed with chloroform. The filtrate was concentrated, and the crude product obtained was purified by silica gel column chromatography (diethyl ether-hexane =1:19 1:4) to give 0.70 g of 4-(2-thiazolylimino)-2,3,6-trimethylphenol as a pale red solid melting at 95°-96° C.

1. temperatureThe mixture was heated
2. temperatureunder reflux for 15 minutes
3. temperatureunder reflux for 2 hours
4. filtrationfiltered through a Celite pad
5. washthe insoluble matter was washed with chloroform
6. concentrationThe filtrate was concentrated
7. customthe crude product obtained
8. customwas purified by silica gel column chromatography (diethyl ether-hexane =1:19 1:4)