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A series of 3-chloroquinoxaline-2-carboxamides were designed and prepared by the condensation of 3-chloro-2-quinoxaloylchloride with appropriate Mannich bases of the p-aminophenol in the microwave environment. The synthesized compounds were evaluated for serotonin(3) (5-HT(3)) receptor antagonistic activities in longitudinal muscle-myenteric plexus (LMMP) preparation from guinea pig ileum against the 5-HT(3) agonist, 2-methyl-5-HT. Compound 3g exhibited comparable 5-HT(3) antagonistic activity (pA(2) 6.4) to that of standard antagonist Ondansetron (pA(2) 6.9), while the other compounds exhibited mild to moderate 5-HT(3) antagonistic activities.

Pharmacophore Based Synthesis of 3-Chloroquinoxaline-2-carboxamides as Serotonin3 (5-HT3) Receptor Antagonist