反应详情

Heat a mixture of thioacetimidic acid 2-(4-methoxyphenyl)-2-oxoethyl ester hydrobromide (10.0 g, 32.9 mmol) and zinc (II) chloride (4.50 g, 33.0 mmol) in methanol (80 mL) at reflux under nitrogen protection for 6.5 hours. Cool the mixture, slowly dilute with saturated NaHCO3 (300 mL), and extract with methylene chloride (400 mL×2). Dry the combined organic extracts over sodium sulfate and remove the solvent under reduced pressure. Purify the crude product by flash column chromatography on silica gel, eluting with hexanes/ethyl acetate (9:1), to provide 4-(4-methoxyphenyl)-2-methylthiazole (6.24 g, 92%): APCI mass spectrum m/z 206 [C11H11NOS+H]+.

1. temperatureHeat
2. temperatureat reflux under nitrogen protection for 6.5 hours
3. temperatureCool the mixture
4. extractionextract with methylene chloride (400 mL×2)
5. dry with materialDry the combined organic extracts over sodium sulfate
6. customremove the solvent under reduced pressure
7. customPurify the crude product by flash column chromatography on silica gel
8. washeluting with hexanes/ethyl acetate (9:1)