Abstract
Gold and silver: When allenyl acetals and nitrones are treated with a catalytic amount of a gold complex and a silver salt they react through a cyclization-cycloaddition cascade reaction to give a mixture of diastereomeric tricyclic products. The mixture converges to a single product upon acid hydrolysis (see scheme). The key intermediate is postulated to be a 1-methoxyfulvene species. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.