Discovery of 2-Aminothiazole-4-carboxamides, a Novel Class of Muscarinic M3 Selective Antagonists, through Solution-Phase Parallel Synthesis
作者:Yufu Sagara、Morihiro Mitsuya、Minaho Uchiyama、Yoshio Ogino、Toshifumi Kimura、Norikazu Ohtake、Toshiaki Mase
DOI:10.1248/cpb.53.437
日期:——
Synthesis and structure–activity relationship of a new class of muscarinic M3 selective antagonists were described. In the course of searching for a muscarinic M3 antagonist with a structure distinct from those of the 2-(4,4-difluorocyclopentyl)-2-phenylacetamide derivatives, we identified a thiazole-4-carboxamide derivative (1) as a lead compound in our in-house chemical collection. Since this compound (1) showed relatively low binding affinity (Ki=140 nM) for M3 receptors in the human binding assays, we tried to improve its potency and selectivity for M3 over M1 and M2 receptors by derivatization of 1 through a combinatorial approach. A solution-phase parallel synthesis effectively contributed to the optimization of each segment of 1. Thus, we have identified a cyclooctenylmethyl derivative (3e) and a cyclononenylmethyl derivative (3f) as representative M3 selective antagonists in this class.
描述了一类新的选择性抗美洲豹M3受体拮抗剂的合成和结构-活性关系。在寻找一种结构与2-(4,4-二氟环戊基)-2-苯乙酰胺衍生物不同的抗美洲豹M3受体拮抗剂的过程中,我们在内部化学库中识别出了一种噻唑-4-氨基甲酸酯衍生物(1)作为领先化合物。由于该化合物(1)在人体结合实验中对M3受体的结合亲和力较低(Ki=140 nM),我们尝试通过组合化学方法对1进行衍生化,以提高其对M3受体的效能和对M1及M2受体的选择性。溶液相平行合成有效地促进了1的每个片段的优化。因此,我们识别出环辛烯基甲基衍生物(3e)和环壬烯基甲基衍生物(3f)作为该类抗美洲豹M3受体选择性拮抗剂的代表。