Palladium-catalyzed decarboxylative allylation of allylic β-ketocarboxylates, which was originally developed by Tsuji and Saegusa, has intensively been studied recently, including asymmetric variants. The decarboxylative allylation was involved With (π-allyl)palladium intermediate. Meanwhile, we have developed palladium-catalyzed nucleophilic substitutions of benzylic carbonates recently. As with Tsuji-Trost reaction, the benzylic carbonate reacts with palladium(0) to give (π-benzyl)palladium, which readily undergoes nucleophilic attack. In this context, we resolved to engage in the actualization of the palladium-catalyzed decarboxylative benzylation of benzyl β-ketocarboxylates.
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