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India has a rich heritage of knowledge on plant based drugs used in
traditional system of medicine. A large number of plants and
remedies were pharmacologically tested and useful data was
generated for development of therapeutic agents. Scientists are
searching newer avenues and material for drug development and for
that they are search for new medicinal plants, which are till date
not have been exploited to their fullest extent (except traditional
systems). The rich biodiversity of the tropical region all over the
world have attracted scientific attention and tropical region of
lower plane land of West Bengal is not an exception of that trend.
Hygrophila difformis is a tropical plant, accordingly in our
laboratory we have chosen this plant for the detail pharmacological
studies to fulfill our quench of thirst and to reveal whether this
plant could be utilized as an effective source for future medicine
development. In the course of the investigation it was found that
the methanolic fraction of the Hygrophila difformis leaf extract
possesses various kinds of activities.
The primary role of medicinal chemist has become one of improving
upon existing drugs by increasing their potency and duration of
action and by decreasing toxic side effects as well as creating new
drugs by molecular modifications. Very useful synthetic analogue
with improved therapeutic properties can be obtained from a single
lead compound by structural modification. The same applies to the
group of natural lactone of plant origin, one of the diverse and
important system of natural products with a broad spectrum
biological activities. Physiological activity of natural lactone is
known ever since santonine was used as anthelmintic and ascarisidal
agent. The biological importance of unsaturated lactone is well
known. The butenolide system is present in many cardiac glycosides
shows strong cardiotonic activity. In particular, the -alkylidene
butenolide skeleton is a useful entity that is present natural
products such as fibrolides, dihydroxerulin and protoanemonin.
Protoanemonin and its analogues possess antiviral, antibiotic and
anticancer activities."
Several sulphur & nitrogen containing heterocyclic compounds
have been studied because of their interesting biological
properties such as Anti-bacterial, Anti-fungal, Anti-hypertensive,
Anti-HIV, Anti-inflammatory, Anti-microbial, Anti-rheumatic, Aldose
reductase inhibitor, ATP-sensitive potassium channel opener.
1,4-Benzothiazine forms an important class of heterocyclic system.
Several studies are available for 1, 4-Benzothiazine formation and
their application in drugs. 1, 4-benzothiazine and thiazoles
constitute an important class of sulfur and nitrogen heterocytes.
The utility of thiazole as medicaments is finally established.
Recently that attention is being directed towards the synthesis of
1,4-benzothiazine, as they are structurally analogues to
phenothiazine nucleus. Luciferin and rifamycin are
1,4-benzothiazine derivatives and are obtained by biosynthesis and
found to posses immense pharmacological activities and also have
application is dyestuff, photographic developer, UV light absorber
and antioxidants.
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