反应详情

温度

2.5 °C

(180 mg, 574 μmol) 5-(2-Chloro-pyridin-4-ylethynyl)-pyridine-2-carboxylic acid tert-butylamide (Example 1, step 2) was dissolved in DMF (3 ml) and cooled to 0-5° C. Iodomethane (54 μl, 860 μmol, 1.5 equiv.) and NaH (55%) (41 mg, 860 μmol, 1.5 equiv.) were added and the mixture was stirred for 2 hours without cooling bath. The reaction mixture was treated with sat. NaHCO3 solution and extracted twice with EtOAc. The organic layers were extracted with water, dried over sodium sulfate and evaporated to dryness. The crude product was purified by flash chromatography on silica gel (20 g, ethyl acetate/heptane gradient, 0:100 to 100:0). The desired 5-(2-chloro-pyridin-4-ylethynyl)-pyridine-2-carboxylic acid tert-butyl-methyl-amide (78 mg, 42% yield) was obtained as a yellow solid, MS: m/e=328.4/330.4 (M+H+).

1. temperaturewithout cooling bath
2. extractionextracted twice with EtOAc
3. extractionThe organic layers were extracted with water
4. dry with materialdried over sodium sulfate
5. customevaporated to dryness
6. customThe crude product was purified by flash chromatography on silica gel (20 g, ethyl acetate/heptane gradient, 0:100 to 100:0)