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Conversion of oxindole alkaloids into indole alkaloids

✍ Scribed by Norio Aimi; Etsuji Yamanaka; Jyunji Endo; Shin-ichiro Sakai; Joju Haginiwa

Publisher
Elsevier Science
Year
1972
Tongue
French
Weight
231 KB
Volume
13
Category
Article
ISSN
0040-4039

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## Abstract The single‐crystal X‐ray structures of speciophylline, mitraphylline, and rhynchophylline, oxindole alkaloids from the Peruvian climbing vine __Uncaria tomentosa__ (Rubiaceae), were determined. The three compounds show Nβ‹…β‹…β‹…Hο£ΏN hydrogen bonding, which has not been observed in the crystal