Niobium pentachloride-mediated novel homologation reactions using α-trialkylstannylmethyl-β-keto esters
Abstract
In the presence of niobium pentachloride (NbCl5), an α-trialkylstannylmethyl-β-keto ester is homologated to the corresponding γ-keto ester in good yield; the reaction mechanism is discussed.