Abstract:
:The side chain benzylic methylene is a critical element for the vanilloid activity of resiniferatoxin (2a, RTX), and introduction of branching, oxygen functions, or isosteric substitution at this center proved detrimental, with a decrease of potency of 2-3 orders of magnitude compared to the natural product. Conversely, only a modest erosion of activity was observed upon alpha-methylation and alpha-methylenation of the side chain. Surprisingly, introduction of an iodine atom in the guaiacyl moiety of the oxygen isoster 2h led to an unexpected and remarkable (>1000-fold) increase of potency, affording 2i, a compound that outperforms RTX in terms of vanilloid agonism and represents the first one-digit picomolar ligand of a TRP channel discovered to date.
journal_name
Bioorg Med Chem Lettjournal_title
Bioorganic & medicinal chemistry lettersauthors
Appendino G,Ech-Chahad A,Minassi A,De Petrocellis L,Di Marzo Vdoi
10.1016/j.bmcl.2009.11.035subject
Has Abstractpub_date
2010-01-01 00:00:00pages
97-9issue
1eissn
0960-894Xissn
1464-3405pii
S0960-894X(09)01605-9journal_volume
20pub_type
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