Novel and versatile protocol for the preparation of functionalized benzocyclotrimers

Abstract 2-Bromo-3-(trimethylstannyl)cyclopenta-1,3-diene is the key-intermediate for the synthesis of vic -bromo(trimethylstannyl)bicycloolefins via Diels–Alder reaction with dienophiles. The cycloadducts can be cyclotrimerized by copper(I) 2-thiophenecarboxylate (CuTC) to afford functionalized benzocyclotrimers.