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Bridged and medium-sized skeletons constitute the basic ones of many important biologically active natural products.We have recently developed an intramolecular cross-cycloaddition(IMCC)[1,2] of donor-acceptor cyclopropanes,which provided a general and efficient strategy for the construction of such skeletons.We report here two recently developed examples.The first one is a Lewis acid-catalyzed [3+3]IMCC of cyclopropane 1,1-diesters for construction of benzobicyclo[2.2.2]octane.