Unlike most other flavonoids,
the isoflavonoid glycosides possess a rather limited taxonomic distribution,
chiefly confined to the family Leguminosae. On the contrary, their
chemical structures display an exceptionally broad spectrum of modifications.
Wong (1975)* carried out an extensive review of the chemistry as well as
taxonomic distribution of isoflavonoids. A few major classes of isoflavonoids
along with their enormous prevailing structural variations are exemplified in
Table 4.1.
Table 4.1 Major Classes of Isoflavonoids
However, there exists a close
relationship with the structure of isoflavones to the skeleton of the rotenoids
(or rotenone), whereas both of them may be regarded as being derived
from 3-phenyl chroman as shown below:
*
Wong, E ‘The Flavonoids’ Chapman
& Hall, London, p. 743-800, 1975.
Source: Pharmacognosy And Pharmacobiotechnology By Ashutosh Kar
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