反应详情

A mixture of 33.0 g. of ethyl p-aminobenzoate, 21.8 g. of 2-(2-thienyl)ethanol O-methanesulfonate (prepared as described in Example 49) and 100 ml. of hexamethylphosphoramide is heated in an oil bath at 125° C. for 16 hours. The mixture is chilled, diluted with 15 ml. of ethanol and 150 ml. of water. The mixture is extracted with ether and the ether extracts washed with water, dried over magnesium sulfate and concentrated in vacuo to give a crude oil. A sample of this oil is chromatographed over silica gel and the fractions containing the product are combined and recrystallized from hexane to give ethyl 4-[2-(2-thienyl)ethylamino]benzoate as yellow-tan crystals, m.p. 93°-95° C.

1. additionA mixture of 33.0 g
2. temperatureThe mixture is chilled
3. additiondiluted with 15 ml
4. extractionThe mixture is extracted with ether
5. washthe ether extracts washed with water
6. dry with materialdried over magnesium sulfate
7. concentrationconcentrated in vacuo
8. customto give a crude oil
9. customA sample of this oil is chromatographed over silica gel
10. additionthe fractions containing the product
11. customrecrystallized from hexane