反应详情

A mixture of 0.1 g. of 3-[4-(diethylamino)benzoyl]-2-pyrazinecarboxylic acid, 0.1 g. of diphenylamine and 2 ml. of acetic anhydride was warmed for several hours and then allowed to stand for three days. The product, 7-[4-(diethylamino)phenyl]-7-(diphenylamino)furo[3,4-b]pyrazine-5(7H)-one was isolated by column chromatography as a light orange solid, m.p. 140°-142.6° C. A toluene solution of this product contacted with acidic clay or phenolic resin developed a red image.

1. additionA mixture of 0.1 g