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Going for gold: 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.
Ferrer et al. (Tue,) studied this question.
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