Synthesis of a wide variety of 3‐amino‐1H‐inden‐1‐ones from N‐tert‐butyl‐2‐(1‐alkynyl)benzaldimines via intramolecular aminocarbonylation of alkynes using Cs₂CO₃ as catalyst and air as oxidant has been developed. This highly atom‐efficient, transition‐metal‐free reaction proceeds under thermal conditions. We propose that the reaction proceeds through an unprecedented 5‐exo‐dig cyclization of N‐tert‐butyl‐2‐(1‐alkynyl)benzaldimines and thermal rearrangement of 3‐methylene‐2λ²‐isoindolin‐1‐ols.

中文翻译：

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Cs2CO3催化炔烃的分子内氨基羰基化：由N-叔丁基-2-（1-炔基）苯并二胺合成3-氨基-1H-茚满-1

的各种各样的合成3-氨基-1- ħ茚-1-酮从ñ -叔丁基-2-（1-炔基）经由使用铯炔烃的分子内的氨基羰基benzaldimines ₂ CO ₃作为催化剂和空气作为氧化剂具有已开发。这种高原子效率，无过渡金属的反应在热条件下进行。我们建议，通过了前所未有的5-反应进行外切-挖环化ñ -叔丁基-2-（1-炔基）benzaldimines和3-亚甲基2λ热重排² -isoindolin -1-醇。