Synthesis of 2-Acyl-1,4-diketones via the Diacylation of α,β-Unsaturated Ketones

The first example of a diacylation of the carbon−carbon double bond in α,β-unsaturated ketones is described. The reaction of acylcyanocuprate reagents with α,β-unsaturated ketones, followed by C-acylation, produces 2-acyl-1,4-diketones in good yields (50−89%).