反应详情

Cyanogen bromide (111 mg, 1.05 mmol) was added to a solution of 4-tert-butyl-N-(4-chloro-2-hydrazinocarbonyl-phenyl)-benzenesulfonamide (200 mg, 0.524 mmol) and potassium carbonate (145 mg, 1.05 mmol) in dioxane (2 mL) and the reaction was stirred for 18 h at room temperature. Isopropyl amine (0.18 mL, 2.09 mmol) and acetic acid (0.15 mL) were added and the reaction was heated at 135° C. for an additional 18 h. The resultant solution was partitioned between ethyl acetate/water and the organic phase was washed with 1N HCl, saturated sodium bicarbonate, and brine; dried over magnesium sulfate, and concentrated in vacuo. The crude product was finally purified by flash column chromatography (10-100% ethyl acetate and hexane) then preparative HPLC (10-90% gradient of MeCN-water) to afford the title compound as a white solid: MS (ES) M+H expected 448.2, found 448.1.

1. temperaturethe reaction was heated at 135° C. for an additional 18 h
2. customThe resultant solution was partitioned between ethyl acetate/water
3. washthe organic phase was washed with 1N HCl, saturated sodium bicarbonate, and brine
4. dry with materialdried over magnesium sulfate
5. concentrationconcentrated in vacuo
6. customThe crude product was finally purified by flash column chromatography (10-100% ethyl acetate and hexane)