The cationic intermediate formed in the ring enlargement step now undergoes an annulation reaction. This reaction involves the formation of new bonds to close the norbornane framework. The cationic intermediate attacks another part of the molecule, leading to the closure of the second ring. This process results in the formation of the desired cis-fused bicyclo[3.2.0]heptane framework.
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6-(trimethylsilyl)-1-(1'-phenylthiocyclopropyl)hex-5-yn-1-ol
2-(4-chlorophenyl)-8-methylimidazo[1,2-a]pyridine
1-phenoxy-2-[1-(phenylsulfanyl)cyclopropyl]-2-propanol
