反应详情

温度

-70 °C

To a stirred solution of 2-chloro-4-methylthiazole (6.35 g) in tetrahydrofuran (50 ml) was added a solution of n-butyllithium in n-hexane (1.66M, 34.35 ml) dropwise at −70° C. under a nitrogen atmosphere, and the mixture was stirred for 20 minutes at −70° C. To the resultant mixture was added a solution of 2-cyano-4-methylpyridine (3.74 g) in tetrahydrofuran (30 ml) dropwise at −70° C., and the mixture was stirred for 15 minutes. The mixture was poured into a saturated aqueous ammonium chloride solution and extracted with ethyl acetate. The organic layer was washed with brine, dried over magnesium sulfate and evaporated. The residue was purified by column chromatography (silica gel 240 g, n-hexane:ethyl acetate=10:1) to give 2-chloro-4-methyl-5-(4-methylpyridin-2-ylcarbonyl)thiazole (1.64 g).

1. stirringthe mixture was stirred for 15 minutes
2. extractionextracted with ethyl acetate
3. washThe organic layer was washed with brine
4. dry with materialdried over magnesium sulfate
5. customevaporated
6. customThe residue was purified by column chromatography (silica gel 240 g, n-hexane:ethyl acetate=10:1)