The stereoselective synthesis of the pyrrolizidine alkaloids (+)-heliotridine and (+)-retronecine from (S)-malic acid has been achieved by employing an intermolecular carbenoid displacement reaction as a key step.
T. Kametani, H. Yukawa and T. Honda, J. Chem. Soc., Chem. Commun., 1988, 685 DOI: 10.1039/C39880000685
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