Polygonapholine
was isolated in 1997 from the Polygonatum
alte-lobatum rhizome. Based on spectroscopic data, it was
assigned a structure comprising an unusual cis-2,6-disubstituted bis-aryl morpholine ring to which is attached a (Z)-4-hydroxycinnamate as an amide and an (E)-4-hydroxycinnamate as an ester. Being a meso compound,
polygonapholine should not exhibit an optical rotation as reported.
A total synthesis of the purported morpholine alkaloid presented herein
reveals discrepancies between the synthetic and the natural product
casting doubt on the originally proposed structure.
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