Cationic gold(I) complexes favor formation of six- and seven-membered rings by 6-endo-dig, 6-exo-dig, and 7-exo-dig cyclizations of alkynyl indoles, whereas indoloazocines are favored with AuCl3 as catalyst (see scheme). Allenes are also formed by a fragmentation process.
C. Ferrer, A. M. Echavarren
Angew. Chem. Int. Ed. 2006, 45, 1105-1109
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