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The cover picture provided by Alexander Ahrens from the group of A. S. K. Hashmi presents the results of their work on the gold‐catalysed cyclisation of amide‐substituted 1,5‐diynes leading to functionalised 1‐indenones. This conversion was achieved by a 1,4‐dioxidation utilising diphenyl sulfoxide as oxidant, which is illustrated by the two skyrockets in the cover picture. Referring to the 20th IUPAC...
Amide‐substituted diynes were cyclized in the presence of a cationic gold catalyst and an external nucleophile leading to 1‐indenones and 1‐iminoindenones. The electron‐donating features of the nitrogen atom enable the formation of a reactive ketene iminium ion, which can be trapped by either diphenyl sulfoxide or anthranil as nucleophiles in a subsequent oxidation step, providing substituted inden‐1‐on‐3‐carboxamides.
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