反应详情

A mixture of 2-chloromethylbenzo[b]thiophene (21 g), potassium cyanide (11.7 g), 1,4-dioxane (200 ml) and water (100 ml) was stirred and heated under reflux for 4 hours, then cooled to ambient temperature and diluted with water (200 ml). The product was extracted into toluene (3×200 ml), then the combined extracts were washed with water (2×300 ml), dried (Na2SO4), and the solvents were removed in vacuo. The residue was purified via flash chromatography over silica using a 1:4 mixture of ethyl acetate and petroleum ether (b.p. 60-80° C.) as eluant. Appropriate fractions were combined and the solvents were removed in vacuo to give benzo[b]thiophen-2-acetonitrile as a yellow solid (8.9 g), m.p. 59-61° C.

1. temperatureheated
2. temperatureunder reflux for 4 hours
3. extractionThe product was extracted into toluene (3×200 ml)
4. washthe combined extracts were washed with water (2×300 ml)
5. dry with materialdried (Na2SO4)
6. customthe solvents were removed in vacuo
7. customThe residue was purified via flash chromatography over silica using
8. additiona 1:4 mixture of ethyl acetate and petroleum ether (b.p. 60-80° C.) as eluant
9. customthe solvents were removed in vacuo