Summary.
The retrosynthetic analysis of Ibogamine, a natural psychotropic alkaloid with exceptional anti-addictive properties found in both enantiomeric forms, requires an efficient access to a racemic cyclohexene. This cyclohexene can be obtained via the sequence Diels-Alder/[3,3] sigmatropic rearrangement reaction starting from substituted 1-thiocyanatobutadienes. An efficient synthesis of the enone, a stable precursor of 1-thiocyanatobutadienes, is reported. Enolisation of this enone was studied to find the optimal conditions to get the desired 1-thiocyanatobutadienes with good Z-selectivity.
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Lanaspèze, S., Neier, R. Synthesis of Substituted 1-Thiocyanatobutadienes and their Application in a Diels-Alder/[3,3] Sigmatropic Rearrangement Tandem Reaction. Monatshefte für Chemie 136, 597–607 (2005). https://doi.org/10.1007/s00706-004-0258-7
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DOI: https://doi.org/10.1007/s00706-004-0258-7