The synthesis of 3-aroylcarbazoles [(a-d)] and the unknown 1-aroylcarbazoles [(a-c)] been achieved by the photolysis of 9-aroylcarbazoles [(a-d)] in polar solvent. Irradiation of (a-c) in non-polar solvent afforded regiospecifically (a-c), carbazole () and for the first time, 9H-indolo [3, 2, 1-de] phenanthridin-9-one () from b. The yield of was significantly improved by UV exposure of 9-(2-iodobenzoyl)-carbazole (e) in methanol and iodine, without providing any photomigrated product.

中文翻译：

---

酰胺类化合物的研究第2部分¹：一种新的光化学合成9H-吲哚并[3,2,1-de]菲啶9-9-，一个苯并鸟氨酸类似物

3-芳酰基咔唑[ （ad）]和未知的1-芳酰基咔唑[ （ac）]的合成是通过9-芳酰基咔唑[ （ad）]在极性溶剂中的光解而实现的。在非极性溶剂中照射（ac），可以从区域上特异性地（ac）提供咔唑（），并首次从b中获得9H-吲哚并[3，2，1-de]菲啶9-one（1 ）。通过将9-（2-碘苯甲酰基）-咔唑（e）在甲醇和碘中进行UV暴露，无需提供任何光迁移的产物，即可显着提高其产率。