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Eur J Med Chem. 2008 Jan;43(1):62-72. Epub 2007 Mar 19.

Carbamoyl tetrazoles as inhibitors of endocannabinoid inactivation: a critical revisitation.

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Dipartimento di Studi Farmaceutici, Università di Roma La Sapienza, piazzale Aldo Moro 5, 00185 Roma, Italy.


We have synthesized a series of 18 1,5- and 2,5-disubstituted carbamoyl tetrazoles, including LY2183240 (1) and LY2318912 (7), two compounds previously described as potent inhibitors of the cellular uptake of the endocannabinoid anandamide, and their regioisomers 2 and 8. We confirm that compound 1 is a potent inhibitor of both the cellular uptake and, like the other new compounds synthesized here, the enzymatic hydrolysis of anandamide. With the exception of 9, 12, 15, and the 2,5-regioisomer of LY2183240 2, the other compounds were all found to be weakly active or inactive on anandamide uptake. Several compounds also inhibited the enzymatic hydrolysis of the other main endocannabinoid, 2-arachidonoylglycerol, as well as its enzymatic release from sn-1-oleoyl-2-arachidonoyl-glycerol, at submicromolar concentrations. Four of the novel compounds, i.e. 3, 4, 17, and 18, inhibited anandamide hydrolysis potently (IC50=2.1-5.4nM) and selectively over all the other targets tested (IC50 >or= 10microM), thus representing new potentially useful tools for the inhibition of fatty acid amide hydrolase.

[Indexed for MEDLINE]

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