Biology Reference
In-Depth Information
HO
HO
OH
OH
HO
HO
HO
HO
HO
HO
OH
OH
O O
OH
O O
OH
O
O
O
O
O
O
OH
OH
O
O
O
O
OH
OH
O
O
OH
O
O
H
O
O
H
O
O
HO
H
HO
O
H
O
O
O
O
OH
OH
O
O
HO
OH
O
HO
OH
O
O
OH
HO
HO
OH
Ascorgeraniin (Elaeocarpusin)
Putranjivain A
HO
HO
OH
OH
HO
HO
HO
HO
HO
HO
OH
OH
O O
OH
O O
OH
O
O
O
O
O
O
OH
OH
O
O
O
O
OH
OH
O
O
O
O
O
O
H
O
HO
N
O
OH
OH
OH
HO
OH
O
OH
OH
N
O
CH 3
Phyllanthusiin D
A phenazine derivative of geraniin
Phyllanthusiin D, a condensation product of geraniin with acetone,
was isolated from acetone and aqueous acetone homogenates of
Phyllanthus flexuosus , Phyllanthus amarus , and also from suspension
cultures of Geranium thunbergii (Yazaki et al. , 1991). In this case, it is
likely that phyllanthusiin D is simply an artefact formed during the
extraction procedure, since it was produced when geraniin was refluxed
in dry acetone containing a small amount of trifluoroacetic acid. One can
here also mention the condensation reaction between geraniin and ortho -
phenylenediamine in weakly acidic media that yields a phenazine
derivative, a reaction commonly used to determine the presence of a
DHHDP group in an ellagitannin molecule.
 
Search WWH ::




Custom Search