Triterpenoids are natural compounds with a large variety of biological activities
such as anticancer, antiviral, antibacterial, antifungal, antiparazitic, antiinflammatory
and others. Despite their low toxicity and simple availability from the natural resources,
their clinical use is still severely limited by their higher IC50 and worse pharmacological
properties than in the currently used therapeutics. This fact encouraged a number of researchers
to develop new terpenic derivatives more suitable for the potential clinical use.
This review summarizes a new approach to improve both, the activity and ADME-Tox
properties by connecting active terpenes to another modifying molecules using click reactions.
Within the past few years, this synthetic approach was well explored yielding a lot
of great improvements of the parent compounds along with some less successful attempts.
A large quantity of the new compounds presented here are superior in both activity and
ADME-Tox properties to their parents. This review should serve the researchers who
need to promote their hit triterpenic structures towards their clinical use and it is intended
as a guide for the chemical synthesis of better drug candidates.
Keywords: Huisgen cycloaddition, triterpene, prodrug, triazole, lupane, oleanane, ursane, ADME.
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