1,1'-Carbonyldiimidazole → HCID 20085575, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 19.09 g (0.0776 mol) of 1,1'-carbonyldiimidazole in approximately 200 ml of dimethylformamide was added slowly to a cold (0° C.) solution of 15.78 g (0.1135 mol) of 3-aminopyrazine-2-carboxylic acid in 150 ml of dimethylformamide. The resulting solution was gradually warmed to 25° C. and stirred for about two hours. A solution of 14.75 g (0.118 mol) of N-(3-aminopropyl)imidazole in approximately 40 ml of dimethylformamide was added and the resulting solution was allowed to react for four hours. After four hours, the reaction solution was reduced to dryness under reduced pressure. The resultant semi-solid was suspended in diethyl ether and the portion which did not dissolve was recovered by filtration. The recovered solid was then suspended in diethyl ether containing a small amount of ethyl acetate and the resulting mixture was stirred for about 48 hours. After stirring for 48 hours, the undissolved solid was isolated by filtration. This solid was purified by filtration through silica gel using 4% methanol in dichloromethane. The resultant purified material was recrystallized from a 1:4 dichloromethane/diethyl ether solution to provide 24.4 g of the desired subtitled intermediate (m.p. 118°-120° C.).

Provenance & Evidence