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The work described in this dissertation was performed in the laboratory of Prof. Gilbert Stork at Columbia University. The thesis describes a total synthesis of (±)-depentylperhydrohistrionicotoxin which is similar to the present work in that it starts from 2,3-epoxycyclohexan-1-one and involves a [2,3] sigmatropic rearrangement (based, however, on sulfur) to set up the spirocyclic centre. A lucid analysis of the stereochemical features of the sigmatropic rearrangement is presented, along with a clever stratagem for control of diastereofacial selectivity in that step, via the ketal shown below. Subsequent elaboration of the spirocycle requires 6 steps and conversion of the ketal to the butyl side-chain 3 steps. The total synthesis requires ca. 18 steps and proceeds in ca. 3% overall yield. (equation presented)
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