Synthesis of Thieno[2,3-d]oxazines and Thieno[2,3-d]thiazines as Subtype Specific Kainate Receptor Antagonists

Title: Synthesis of Thieno[2,3-d]oxazines and Thieno[2,3-d]thiazines as Subtype Specific Kainate Receptor Antagonists

Volume: 16 Issue: 35

Author(s): D. Briel, A. Rybak, S. Mann, C. Kronbach and K. Unverferth

Affiliation:

Keywords: Glutamate receptor antagonists, kainate receptor antagonists, anticonvulsives, thieno[2,3-d][1.3]oxazines, thieno[2,3-d][1.3]thiazines, thieno[2,3-d]-pyrimidines

Abstract: For the development of new antiepileptics the kainate receptors, GluR6 and GluR5, are important targets. Based on the anticonvulsant effects of chinazolines and thieno[2,3-d]pyrimidines that are known from the literature, thieno[2,3-d][1.3]oxazines were synthesized and studied for their inhibitory properties at GluR6 and GluR5 receptors. The strongest inhibitor activity was observed with 5-methyl-6-phenyl-thieno[2,3-d][1.3]oxazines with C1 or C3-substituents in position 2 (3b-f). The 2-trihalide-methyl-substituted compounds 3c and 3d were the most active inhibitors at the GluR5- receptor (IC50=23.4 μmol, 16 μl). The 2-isopropyl-substituted compound 3f displayed the strongest activity at the GluR6- receptor (IC50=8.7 μmol). A number of thieno[2,3-d][1.3]thiazines and thieno[2,3-d]pyrimidines that were synthesized from the thieno[2,3][1.3]oxazines did not show any activity.

Cite this article as:

Briel D., Rybak A., Mann S., Kronbach C. and Unverferth K., Synthesis of Thieno[2,3-d]oxazines and Thieno[2,3-d]thiazines as Subtype Specific Kainate Receptor Antagonists, Current Medicinal Chemistry 2009; 16 (35) . https://dx.doi.org/10.2174/092986709789878283