反应详情

36 g (0.26 mol) of 3-aminopyridine-2-carboxylic acid, 46.6 g (0.29 mol) of N,N'-carbonyldiimidazole and 200 ml of dimethylformamide are stirred at room temperature until the carbon dioxide evolution has finished, then the mixture is treated with 26.3 g (0.26 mol) of triethylamine and 43.1 g (0.26 mol) of methyl L-prolinate and stirred at room temperature for a further 1.5 hours. Subsequently, the solution is poured into water, extracted four times with chloroform, the combined chloroform extracts are dried over magnesium sulphate and then evaporated in vacuo. The oily residue is treated with 500 ml of glacial acetic acid, heated to boiling under reflux for 1 hour and then evaporated to dryness. By recrystallization from ethanol there is obtained 6a,7,8,9-tetrahydro-6H-pyrido[3,2-e]pyrrolo[1,2-a][1,4]diazepine-6,11(5H)-dione of melting point 249°-250°.

1. extractionextracted four times with chloroform
2. dry with materialthe combined chloroform extracts are dried over magnesium sulphate
3. customevaporated in vacuo
4. additionThe oily residue is treated with 500 ml of glacial acetic acid
5. temperatureheated
6. temperatureunder reflux for 1 hour
7. customevaporated to dryness
8. customBy recrystallization from ethanol