Palladium(0)-catalysed cyclisation of 3-acetoxy-1-(4-aminoalkyl)cyclohexenes provides easy access to the 1-azaspiro[5.5]undecane ring system found in the histrionicotoxins; this has been exploited in a synthesis of (±)-depentylperhydrohistrionicotoxin.
W. Carruthers and S. A. Cumming, J. Chem. Soc., Chem. Commun., 1983, 360 DOI: 10.1039/C39830000360
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