Abstract:
:A class of tetracyclic terpenes was synthesized and evaluated for antagonistic activity of endothelin-1 (ET-1) induced vasoconstriction and inhibitory activity of voltage-activated Ca(2+) channels. Three repeated Robinson annulation reactions were utilized to construct the tetracyclic molecules. A stereoselective reductive Robinson annulation was discovered for the formation of optically pure tricyclic terpenes. Stereoselective addition of cyanide to the hindered α-face of tetracyclic enone (-)-18 was found and subsequent transformation into the aldehyde function was affected by the formation of bicyclic hemiiminal (-)-4. Six selected synthetic tetracyclic terpenes show inhibitory activities in ET-1 induced vasoconstriction in the gerbil spiral modiolar artery with putative affinity constants ranging between 93 and 319 nM. Moreover, one compound, (-)-3, was evaluated further and found to inhibit voltage-activated Ca(2+) currents but not to affect Na(+) or K(+) currents in dorsal root ganglion cells under similar concentrations. These observations imply a dual mechanism of action. In conclusion, tetracyclic terpenes represent a new class of hit molecules for the discovery of new drugs for the treatment of pulmonary hypertension and vascular related diseases.
journal_name
Bioorg Med Chemjournal_title
Bioorganic & medicinal chemistryauthors
Lu J,Aguilar A,Zou B,Bao W,Koldas S,Shi A,Desper J,Wangemann P,Xie XS,Hua DHdoi
10.1016/j.bmc.2015.06.055subject
Has Abstractpub_date
2015-09-01 00:00:00pages
5985-98issue
17eissn
0968-0896issn
1464-3391pii
S0968-0896(15)00549-0journal_volume
23pub_type
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