followed by cyclization, 6,7-dimethylindolizine-5,8-dione was obtained. The process failed with maleic anhydride. Pyrrolo[1,2-b]isoquinoline-5,10-dione could be dinitrated in the pyrrolo ring (with some oxidation to isoquinoline-1,3,4-trione), reduced to 10-hydroxy-3,5-dihydropyrrolo[1,2-b]isoquinolin-5-one by zinc and acetic acid, and hydrogenated over palladium on carbon to 10-hydroxy-1,2,3,5-tetrahydropyrrolo[l
由
邻苯二甲酸酐和
吡咯基卤化
镁合成
吡咯并
异喹啉二酮已得到改进。通常优选通过新的1-(2-羧基苯甲酰基)
吡咯的环化来进行新的合成。由
吡咯基
溴化镁和二甲基
马来酸酐,然后环化,得到6,7-二甲基
吲哚嗪-5,8-二酮。用
马来酸酐使该方法失败。
吡咯并[1,2 - b ]
异喹啉-5,10-二酮可在
吡咯并环中被硝化(并氧化成
异喹啉-1,3,4-三酮),还原为10-羟基-3,5-二氢
吡咯并[ 1,2 - b ]
异喹啉-5-酮由
锌和
乙酸制得,并在
钯/碳上氢化成10-羟基-1,2,3,5-
四氢吡咯并[l,2- b] isoquinolin-5-one。二氢衍
生物在空气中转化为二酮。