A formal [3+2] cyclization mediated by silver(I) oxide and 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU) is described herein. Through a broad variety of carbonyl compounds, this system can promote cyclization reactions with high yield (up to 85 %) and diastereoselectivity (up to 95:5) for a straightforward access to complex and congested dihydrofuran derivatives in one step under mild conditions. Based