Abstract
THE scheme for the formation of sparteine suggested by Robinson1 in his theory of the phyto-chemical synthesis of alkaloids is incorrect, being based on the then prevailing erroneous conception of its structure. Ctemo, Raper and Short2 have since shown clearly that the alkaloid must have the structure (II). However, a logical extension of Robinson's general ideas leads to the following formulations for the biosynthesis of sparteine (II) and lupinine (III). 
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References
Robinson, R., J. Chem. Soc., 111, 876 (1917).
Clemo, G. R., Raper, R., and Short, W. S., J. Chem. Soc., 663 (1949).
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ANET, E., HUGHES, G. & RITCHIES, E. A Synthesis of Sparteine. Nature 165, 35–36 (1950). https://doi.org/10.1038/165035a0
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DOI: https://doi.org/10.1038/165035a0
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