Synthesis of 1,4-Benzodiazepine-2,5-diones by Base Promoted Ring Expansion of 3-Aminoquinoline-2,4-diones
作者:Filip Křemen、Martin Gazvoda、Stanislav Kafka、Karel Proisl、Anna Srholcová、Antonín Klásek、Damijana Urankar、Janez Košmrlj
DOI:10.1021/acs.joc.6b01497
日期:2017.1.6
An unprecedented reactivity of 3-aminoquinoline-2,4-diones is reported. Under basic conditions, these compounds undergo molecular rearrangement to furnish 1,4-benzodiazepine-2,5-diones. The transformations take place under mild reaction conditions by using 1,1,3,3-tetramethylguanidine, NaOEt, or benzyltrimethylammonium hydroxide as a base. A proposed mechanism of the rearrangement and the conformational
据报道3-氨基喹啉-2,4-二酮具有空前的反应性。在碱性条件下,这些化合物会进行分子重排以提供1,4-苯并二氮杂-2,5-二酮。通过使用1,1,3,3-四甲基胍,NaOEt或苄基三甲基氢氧化铵为碱,在温和的反应条件下进行转化。讨论了1,4-苯并二氮杂-2,5-二酮环的重排和构象平衡的机理。