反应详情

To 30 ml. of toluene were added 3.0 g. of methyl 6-chloro-5-ethylamino-3-methoxypyrazine-2-carboxylate and 3.0 g. of 2-aminomethyl-1-methylpyrrolidine and the mixture was refluxed for 4 days. The reaction mixture was acidified with hydrochloric acid at room temperature and then extracted twice each time with 30 ml. of water. From the toluene layer, 0.9 g. of methyl 6-chloro-5-ethylamino-3-methoxypyrazine-2-carboxylate used as the starting material was recovered. The extracts were combined, basified with aqueous ammonia and extracted three times each time with 30 ml. of chloroform. The extracts were combined and evaporated to dryness. By adding 50 ml. of ether to the residue formed, 1.0 g. of crystals of N-(1-methylpyrrolidin-2-ylmethyl)-6-chloro-5-ethylamino-3-methoxypyrazine-2-carboxamide were obtained. The colorless acicular crystals obtained by recrystallizing the product from a mixture of benzene and n-hexane melted at 126°-127° C.

1. extractionextracted twice each time with 30 ml
2. customwas recovered
3. extractionextracted three times each time with 30 ml
4. customevaporated to dryness
5. additionBy adding 50 ml
6. customof ether to the residue formed