反应详情

A stirred solution of 2-[(2-acetylamino-ethylcarbamoyl)-methyl]-4-methyl-1H-pyrrole-3-carboxylic acid ethyl ester (500 mg, 1.695 mmol) in anhydrous tetrahydrofuran (10 ml) was added dropwise slowly with 1M borane-tetrahydrofuran complex in tetrahydrofuran (6.75 ml, 6.75 mmol) under an argon atmosphere. Upon completion of the addition, the mixture was heated to reflux for 7 hours The mixture was concentrated under reduced pressure. The residue was added with water (10 ml) and adjusted to pH 3 with 2N hydrochloric acid. The resulting mixture was adjusted to pH 14 with 2N aqueous sodium hydroxide solution and extracted with ethyl acetate (10 ml×3). The combined organic extracts were washed with brine (20 ml), dried over anhydrous sodium sulfate and concentrated under reduced pressure to give 2-[2-(2-ethylamino-ethylamino)-ethyl]-4-methyl-1H-pyrrole-3-carboxylic acid ethyl ester (400 mg, 88%) as a brown solid.

1. additionUpon completion of the addition
2. temperaturethe mixture was heated
3. temperatureto reflux for 7 hours The mixture
4. concentrationwas concentrated under reduced pressure
5. additionThe residue was added with water (10 ml)
6. extractionextracted with ethyl acetate (10 ml×3)
7. washThe combined organic extracts were washed with brine (20 ml)
8. dry with materialdried over anhydrous sodium sulfate
9. concentrationconcentrated under reduced pressure