Bioisosteric replacement of central 1,2,4-oxadiazole ring of high affinity CB<sub>2</sub> ligands by regioisomeric 1,3,4-oxadiazole ring
作者:Dominik Heimann、Corinna Lueg、Henk de Vries、Bastian Frehland、Dirk Schepmann、Laura H. Heitman、Bernhard Wünsch
DOI:10.1039/c7md00296c
日期:——
replacement of an 1,2,4-oxadiazole ring by an 1,3,4-oxadiazole ring leads to higher polarity, reduced metabolic degradation by human liver microsomes and reduced interaction with hERG channels. In a seven to eight step synthesis 1,3,4-oxadiazles 9a–c were synthesized as bioisosteric analogs of high-affinity but rather lipophilic CB2 ligands 1a–c containing an 1,2,4-oxadiazole ring. The 1,3,4-oxadiazole
据报道,用1,3,4-恶二唑环生物等位取代1,2,4-恶二唑环可导致更高的极性,减少的人肝微粒体代谢降解以及减少与hERG通道的相互作用。在七到八步的合成过程中,合成了1,3,4-恶二唑9a-c作为具有高亲和力但亲脂性CB 2配体1a-c的生物立体异构体,其中CB 2配体1a-c含有1,2,4-恶二唑环。1,3,4-恶二唑衍生物9a和9b分别比1,2,4-恶二唑衍生物1a和1b降低了10倍和50倍的CB 2亲和力。但是1,3,4-恶二唑9a具有较高的CB 2亲和力(K i = 25 nM)和对CB 1受体的高选择性。