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1 H and 13 C NMR assignments of two new isomeric bisbenzylisoquinoline alkaloids from Cissampelos sympodialis Eichl. (Menispermaceae)
Author(s) -
Marinho Alexsandro Fernandes,
Jesus Oliveira Eduardo,
Tavares Josean Fechine,
Filho Raimundo Braz,
BarbosaFilho Jose Maria
Publication year - 2013
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.3941
Subject(s) - chemistry , menispermaceae , stereochemistry , rhizome , two dimensional nuclear magnetic resonance spectroscopy , carbon 13 nmr , ranunculaceae , alkaloid , traditional medicine , botany , medicine , biology
des‐7′‐ O ‐methylroraimine (compound 1) and epi‐des‐7′‐ O ‐methylroraimine (compound 2), two new isomeric bisbenzylisoquinoline alkaloids were isolated and characterized as a mixture from the rhizomes of Cissampelos sympodialis Eichl. The unambiguous structural elucidation of both isomers was performed with the aid of HR‐ESI‐MS, FT‐IR, and NMR techniques including COSY, HMQC, HMBC, and NOESY. Copyright © 2013 John Wiley & Sons, Ltd.