The pyrrolizidine alkaloids, (±)-trachelanthamidine, (±)isoretronecanol, and (±)-supinidine were synthesized by using an intramolecular carbenoid displacement (ICD) reaction of the diazo-sulphide or the diazo-selenide derivatives as a key step.
T. Kametani, H. Yukawa and T. Honda, J. Chem. Soc., Perkin Trans. 1, 1988, 833 DOI: 10.1039/P19880000833
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