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Under catalysis with ZnI(2), an effective annulation process of ω-silylacetylenic α-cyano ketones, leading to the formation of various bicyclic frameworks characterized with a TMS-containing methylenecyclopentane ring, has been developed.
Starting from 4-methylcyclohexanone (7), a concise total synthesis of the pinguisane-type sesquiterpenoid acutifolone A, in racemic form, has been accomplished in 14 steps with an overall yield of 14.5%.