反应详情

[2-Methyl-4-(2-methyl-pyridin-4-ylcarbamoyl)-thiazol-5-yl]-carbamic acid tert-butyl ester (0.532 g, 1.53 mmol) was dissolved in 12 mL trifluoroacetic acid and stirred at room temperature for 30 min. The reaction mixture was treated with 2N sodium carbonate solution until pH 10 and extracted three times with ethyl acetate (50 mL each). The organic phases were pooled, dried with sodium sulfate and evaporated. The crude product was flash-chromatographed on silica gel with heptane/ethyl acetate 100:0→0:100 gradient to yield 5-amino-2-methyl-thiazole-4-carboxylic acid (2-methyl-pyridin-4-yl)-amide as a light yellow solid (0.361 g, 95%), MS (ISP): m/e=249.1 (M+H+).

1. extractionextracted three times with ethyl acetate (50 mL each)
2. dry with materialdried with sodium sulfate
3. customevaporated
4. customThe crude product was flash-chromatographed on silica gel with heptane/ethyl acetate 100:0→0:100 gradient