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13 C‐NMR. Analysis of the Roxburghines
Author(s) -
Merlini Lucio,
Mondelli Rosanna,
Nasini Gianluca,
Wehrli Felix W.,
Hagaman Edward W.,
Wenkert Ernest
Publication year - 1976
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19760590641
Subject(s) - chemistry , stereochemistry
The 13 C shifts of the alkaloids roxburghine B, C, D and E are determined. They confirm the following configurations for the last three bases: C(18α)‐ normal , C(18α)‐ pseudo and C(18β)‐ pseudo , respectively. Roxburghine B is shown to be a C(18β)‐ epi‐allo isomer.