反应详情

A solution of 4-amino-2-chlorobenzonitrile (30.5 g, 0.2 mol) in 1:1 diethyl ether/3M HCl (600 mL) at 0° C. was treated dropwise over 15 minutes with a solution of sodium nitrite (18 g, 0.26 mol) in water (100 mL), stirred 15 minutes, then treated with a solution of potassium iodide (50 g, 0.3 mol) in water (50 mL) dropwise over 45 minutes, warmed to room temperature, and stirred for 1.5 hours. The organic phase was washed with water (3×100 mL) and the combined aqueous layers were extracted with diethyl ether. The combined organic layers were combined, washed sequentially with saturated NaHCO3, 25% Na2S2O3, and brine, dried (MgSO4), filtered, and concentrated. The concentrate was purified by flash column chromatography on silica gel with 19:1/hexanes:ethyl acetate, triturated in hexanes, filtered, and dried to provide the desired product.

1. stirringstirred for 1.5 hours
2. washThe organic phase was washed with water (3×100 mL)
3. extractionthe combined aqueous layers were extracted with diethyl ether
4. washwashed sequentially with saturated NaHCO3, 25% Na2S2O3, and brine
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated
8. customThe concentrate was purified by flash column chromatography on silica gel with 19:1/hexanes
9. customethyl acetate, triturated in hexanes
10. filtrationfiltered
11. customdried