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The case for a revised structure for hypophyllanthin - an analysis of the 13C N.M.R. spectra of aryltetralins

✍ Scribed by R.S. Ward; P. Satyanarayana; L. Ramachandra Row; B.V. Gopala Rao

Publisher
Elsevier Science
Year
1979
Tongue
French
Weight
225 KB
Volume
20
Category
Article
ISSN
0040-4039

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✦ Synopsis

A revised structure for hypophyllanthin is proposed on the basis of its 13 C n.m.r. spectrum. 13 C n.m.r. spectra also support the previously proposed structure for nirtetralin and assist in the structural elucidation of a new aryltetralin lignan. Considerable controversy surrounds the structures of the lignans from Phyllanthus niruri.1-6 Thus, while Stevenson has recently proposed a revised structure for phyltetralin! three structures have over the years been suggested for hypophyllanthin. l-3 Examination of the l3 C n.m.r. spectra of nirtetralin and hypophyllanthin confirms structure (L)4 for nirtetralin but suggests that the correct structure for hypophyllanthin is in fact (2)

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