Recently we reported that the IMDA reaction of 1,7,9-decatrienoates can be efficiently promoted by a bidentate Lewis acid, in particular bis-aluminated trifluoromethane-sulfonamide generated in situ by mixing TfNH 2 (1 mol) and methylaluminum reagent (2 mol) (Eq. 1). 11 We assumed that coordination of both oxygen atoms of the ester group to a bidentate Lewis acid (possibly in equilibrium with other complex forms such as a double coordination form toward ...
