Herein, the development of a light-mediated synthesis of functionalized indolines and tetrahydroquinolines is reported. These structural motifs are considered as highly valuable targets, attributed to their widespread occurrence in pharmaceuticals and natural products. The gold-mediated approach offers a direct route to functionalized indolines in yields of up to 81% under mild photochemical conditions. Thereby, easily accessible Boc-protected N-aryl-allylamine and homoallylamine derivatives were reacted with sp³-hybridized haloalkanes in an intermolecular cascade cyclization reaction. A broad scope of substrates, including a variety of different substituents on the aromatic backbone as well as various haloalkanes, could be utilized. Indoline derivatives, which are functionalized in position 2, are also accessible by applying ortho-allylic anilines. Moreover, the synthetic appeal was demonstrated for a total synthesis of the anti-inflammatory agent AN669 in three reaction steps in an overall yield of 64%.

中文翻译：

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通过光化学级联环化反应轻松获得功能化二氢吲哚和四氢喹啉


在此，报道了官能化二氢吲哚和四氢喹啉的光介导合成的发展。这些结构基序被认为是非常有价值的目标，因为它们在药物和天然产物中广泛存在。金介导的方法提供了一种直接途径来制备功能化二氢吲哚，在温和的光化学条件下产率高达 81%。因此，易于获得的Boc保护的N-芳基-烯丙胺和高烯丙胺衍生物与sp ³ -杂化卤代烷在分子间级联环化反应中发生反应。可以使用多种底物，包括芳香族主链上的各种不同取代基以及各种卤代烷。在位置 2 上进行功能化的二氢吲哚衍生物也可以通过应用邻烯丙基苯胺来获得。此外，通过三个反应步骤全合成抗炎剂 AN669 的合成吸引力得到了证明，总产率为 64%。