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Metal-mediated cyclization of aryl and benzyl glycidyl ethers: a complete scenario.

Journal of the American Chemical Society (2008-12-05)
Rocío Marcos, Carles Rodríguez-Escrich, Clara I Herrerías, Miquel A Pericàs
ABSTRACT

Enantiomerically pure aryl and benzyl glycidyl ethers undergo stereospecific cyclizations leading to 3-chromanols or to tetrahydrobenzo[c]oxepin-4-ols under mild conditions in the presence of a catalytic amount of FeBr3/3AgOTf. The same processes are also mediated, albeit in a much less efficient manner, by AuCl3/3AgOTf. The set of active mediators in this group of processes (BF3 x Et2O, FeBr3, FeBr3/3AgOTf, AuCl3/3AgOTf) shows its nature as Friedel-Crafts reactions and disfavors the intermediacy of arylgold species.