反应详情

3.25 g of 6-amino-4-methyl-beta-carboline-3-carboxylic-acid-ethylester in 70 ml of ethanol, together with 1.7 ml of 1,4-dichloro-2-cis-butene and 4.5 g of ethyldiisopropylamine is heated for 10 h at 50° C. After stirring in 250 ml of ice water, the precipitate is filtered, washed and dried in vacuum. The raw product (3.4 g of a mixture of dihydropyrrole derivative and pyrrole derivative) is dissolved in 600 ml of methylene chloride and, after addition of 17 g of pyrolusite, is stirred for 2 h at a room temperature. After filtering, and distilling off the solvent, 2.75 g of raw product is obtained crystallizing out of acetone. In this manner, 2.13 g of 4-methyl-6-(1-pyrrolyl)-beta-carboline-3-carboxylic-acid-ethylester with a m.p. of 214°-217° C. is obtained.

1. filtrationthe precipitate is filtered
2. washwashed
3. customdried in vacuum
4. dissolutionThe raw product (3.4 g of a mixture of dihydropyrrole derivative and pyrrole derivative) is dissolved in 600 ml of methylene chloride
5. additionafter addition of 17 g of pyrolusite
6. filtrationAfter filtering
7. distillationdistilling off the solvent
8. custom2.75 g of raw product is obtained
9. customcrystallizing out of acetone