The alkaloid vallesamine has been prepared by partial synthesis from stemmadenine using a modified Polonovsky reaction in a sequence which provides a biogenetic model for this class of alkaloid.
A. I. Scott, C.-L. Yeh and D. Greenslade, J. Chem. Soc., Chem. Commun., 1978, 947 DOI: 10.1039/C39780000947
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