摘要:
Series of compounds were generated via the bioisosteric replacement of the carboxylate of 4-ACPCA (2) with hydroxamate or amide groups. All compounds from this study exhibited increased selectivity for GABA(C), the most potent being 4-ACPHA (10a, IC50 = 13 mu M) and 4-ACPAM (11a, IC50 = 10 mu M). This provides evidence that a zwitterionic structure is not essential for GABA(C) antagonists, rather the emphasis lies in appropriate heteroatoms to participate in hydrogen bonding.