A novel visible-light-induced cascade radical cyclization reaction of 3-cyano-4-aryl-1,4-dihydropyridines for the construction of 3,12-diazatetracyclododecane-diene derivatives is reported for the first time. In the presence of 410 nm blue LED lamp as the light source and ethanol as the solvent, the reactions proceed smoothly to afford photocyclization products in good yields. The process is carried out through the breaking of original C═C double bonds and the formation of three new single bonds in one pot and proved to be able to tolerate different substituents.

中文翻译：

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通过意外的可见光诱导自由基级联环化构建 3,12-二氮杂四环十二烷-二烯

首次报道了一种新型可见光诱导的 3-氰基-4-芳基-1,4-二氢吡啶的级联自由基环化反应，用于构建 3,12-二氮杂四环十二烷-二烯衍生物。在 410 nm 蓝色 LED 灯作为光源，乙醇作为溶剂的情况下，反应顺利进行，以良好的收率得到光环化产物。该过程是通过破坏原始C=C双键并在一锅中形成三个新的单键来进行的，并证明能够容忍不同的取代基。