Schmidt reaction (sodium azide/sulfuric acid) of 1,5- and of 1,8-dichloroanthraquinones gives, in each case, both of the theoretically possible lactams (2,3,5,6-dibenzoazepin-4,7-diones). Two of the four theoretically possible lactams have been identified from Schmidt reaction of 1- and 2-chloroanthraquinones respectively. Methods used include: (a) preferential hydrolysis of one lactam and identification of the isomeric aminoanthraquinone formed on cyclodehydration of the resulting amino acid; (b) identification of the isomeric aminoanthraquinone(s) formed on direct treatment of a lactam (or mixture of lactams) by sulfuric acid; (c) cleavage by potassium tert-butoxide of the amino acid formed by preferential hydrolysis of one lactam and identification of the resulting benzoic acid as its methyl ester.
Schmidt反应(偏氮叠氮/硫酸)对1,5-和1,8-二氯蒽醌的反应在每种情况下都会产生两种理论上可能的内酰胺(2,3,5,6-二苯并氮杂吡啉-4,7-二酮)。从1-和2-氯蒽醌的Schmidt反应中分别鉴定了四种理论上可能的内酰胺中的两种。使用的方法包括:(a)优先水解一种内酰胺,并在生成的氨基酸环脱水后鉴定所得异构氨基蒽醌;(b)直接用硫酸处理一种内酰胺(或内酰胺混合物)并鉴定所得的异构氨基蒽醌;(c)用叔丁醇钾裂解通过优先水解一种内酰胺生成的氨基酸,并将所得苯甲酸酯鉴定为其甲酯。