Abstract
In an acidic medium the criss-cross cycloadduct 2 with four fused five-membered rings rearranges to a heterocyclic compound 3 with a completely different structure consisting of two six-membered and two five-membered rings. This newly discovered rearrangement was observed in the presence of a reducing agent (NaBH 3CN). The rearrangement proceeds easily and with an extremely high yield.
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