反应详情

To a solution of 1.00 g (2.82 mmol) (6-chloro-4-iodo-pyridin-3-yl)-carbamic acid tert-butyl ester in 10 ml DMF were added 0.12 g (3.1 mmol) sodium hydride (60% in mineral oil) at −10° C. (The preparation of (6-chloro-4-iodo-pyridin-3-yl)-carbamic acid tert-butyl ester has been described in US 2002/0022624 A1.) The reaction mixture was allowed to warm to room temperature. After 1 h, the mixture was cooled back to −10° C., and 0.44 ml (7.1 mmol) iodomethane were added during 5 min. The reaction mixture was allowed to warm to room temperature. After 2.5 h at room temperature, the reaction was quenched by addition of 10 ml of a saturated aqueous solution of NaHCO3 and the mixture was extracted with ethyl acetate. The combined organic layers were washed with brine, dried over Na2SO4 and concentrated in vacuo. The crude product was purified by column chromatography (silica gel, hexanes/ethyl acetate=4:1) to give 1.06 g (100%) of the title compound as a colorless oil.

1. temperaturethe mixture was cooled back to −10° C.
2. temperatureto warm to room temperature
3. waitAfter 2.5 h at room temperature
4. customthe reaction was quenched by addition of 10 ml of a saturated aqueous solution of NaHCO3
5. extractionthe mixture was extracted with ethyl acetate
6. washThe combined organic layers were washed with brine
7. dry with materialdried over Na2SO4
8. concentrationconcentrated in vacuo
9. customThe crude product was purified by column chromatography (silica gel, hexanes/ethyl acetate=4:1)