反应详情

5-Formyl-4-(1-(2-fluoro-4-biphenylyl)ethyl)-2-methylaminothiazole (1.00 g, 2.9 mmoles) was dissolved in acetone (20 ml). Jones reagent (chromic acid (VI) dissolved in a mixture of concentrated sulfuric acid and water) (2 ml) was added dropwise thereinto while cooling the system with ice, after which it was stirred for one hour. Then, an additional 2 ml of Jones reagent was added dropwise and the resulting mixture was stirred for one hour. A small quantity of 2-propyl alcohol was added to the reaction mixture, it was extracted with ether, and the ether layer was washed with water and dried over sodium sulfate. The solvent was distilled off under reduced pressure, and the residue was recrystallized from ethyl acetate to obtain the desired 4-(1-(2-fluoro-4-biphenylyl)ethyl)-2-methylamino-5-thiazolecarboxylic acid (205 mg, 0.58 mmole, yield 20%) as a white crystalline product.

1. additionwas added dropwise
2. temperaturewhile cooling the system with ice
3. stirringthe resulting mixture was stirred for one hour
4. extractionwas extracted with ether
5. washthe ether layer was washed with water
6. dry with materialdried over sodium sulfate
7. distillationThe solvent was distilled off under reduced pressure
8. customthe residue was recrystallized from ethyl acetate