The new alkaloids, the presecamines (I) or (II), rearrange by acid catalysis to the corresponding secamines, and are Diels–Alder type dimers of secodines (III) containing an α-acrylic ester function; these thermally derived monomers dimerise back to the corresponding presecamine.
G. A. Cordell, G. F. Smith and G. N. Smith, J. Chem. Soc. D, 1970, 191 DOI: 10.1039/C29700000191
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