Synthesis of α‐Ketoamide‐Based Stereoselective Calpain‐1 Inhibitors as Neuroprotective Agents
作者:Ammar Jastaniah、Irina N. Gaisina、Rachel C. Knopp、Gregory R. J. Thatcher
DOI:10.1002/cmdc.202000385
日期:2020.12.3
potentially including ABT‐957 was optimized to yield diastereomerically pure compounds that are potent and selective for calpain‐1 over papain and cathepsins B and K. As the final oxidation step, with its optimized synthesis protocol, does not alter the configuration of the substrate, the synthesis of the diastereomeric pair (R)‐1‐benzyl‐N‐((S)‐4‐((4‐fluorobenzyl)amino)‐3,4‐dioxo‐1‐phenylbutan‐2‐yl)‐5‐oxopy
钙蛋白酶抑制剂已被提议作为神经退行性疾病的候选药物,ABT-957 已进入阿尔茨海默病和轻度认知障碍的临床试验。ABT-957 的结构最近才被公开,由于 CNS 浓度不足以获得药效学效果,试验被终止。对可能包括 ABT-957 的 α-酮酰胺类肽模拟抑制剂系列的多步合成进行了优化,以产生非对映异构纯的化合物,这些化合物对 calpain-1 比木瓜蛋白酶和组织蛋白酶 B 和 K 更有效且具有选择性。作为最后的氧化步骤,其优化合成方案,不改变底物的构型,非对映体对 ( R )-1-苄基-N -(( S)-4 - ((4-氟苄基)氨基)-3,4-二氧代-1-苯基丁-2-基)-5-氧代吡咯烷-2-甲酰胺(图1c)和(- [R)-1-苄基- ñ - (( R )-4-((4-fluorobenzyl)amino)-3,4-dioxo-1-phenylbutan-2-yl)-5-oxopyrrolidine-2-carboxamide