The first diastereo‐ and enantioselectiveinverseelectrondemandhetero‐Diels–Alderreaction of β,γ‐unsaturated α‐ketoesters with allylsilanes is described. Chiralcopper(II) catalysts successfully activate the β,γ‐unsaturated α‐ketoesters and promote the reaction with allylsilanes with excellent enantioselectivities. This process represents a new entry to chiral oxanes.