N‐Alkyl‐N‐(2‐(1‐arylvinyl)aryl)cinnamamides are converted into natural product inspired scaffolds via iridium photocatalyzed intramolecular [2+2] photocycloaddition. The protocol has a broad substrate scope, whilst operating under mild reaction conditions. Tethering four components forming a trisubstituted cyclobutane core builds rapidly high molecular complexity. Our approach allows the design and synthesis of a variety of tetrahydrocyclobuta[c]quinolin‐3(1H)‐ones, in yields ranging between 20–99 %, and with excellent regio‐ and diastereoselectivity. Moreover, it was demonstrated that the intramolecular [2+2]‐cycloaddition of 1,7‐enynes—after fragmentation of the cyclobutane ring—leads to enyne‐metathesis‐like products.

中文翻译：

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N-烷基-N-（2-（1-（芳基乙烯基）芳基）肉桂酰胺的光催化分子内[2 + 2]环加成反应

N-烷基-N-（ 2-（1-芳基乙烯基）芳基）肉桂酰胺通过铱光催化的分子内[2 + 2]光环加成反应转变为天然产物。该协议具有广泛的底物范围，同时在温和的反应条件下运行。束缚形成三取代的环丁烷核心的四个成分会迅速建立高分子复杂性。我们的方法允许设计和合成多种四氢环丁酮[ c ]喹啉-3（1 H）-酮，产率在20–99％之间，并且具有出色的区域选择性和非对映选择性。此外，已证明在环丁烷环断裂后，1,7-烯炔的分子内[2 + 2]-环加成反应会导致类似烯炔的复分解。