Syntheses and biological evaluation of novel quinuclidine derivatives as squalene synthase inhibitors
作者:Tsukasa Ishihara、Hirotoshi Kakuta、Hiroshi Moritani、Tohru Ugawa、Shuichi Sakamoto、Shin-ichi Tsukamoto、Isao Yanagisawa
DOI:10.1016/s0968-0896(03)00143-3
日期:2003.5.29
series of quinuclidine derivatives incorporating a tricyclic system was synthesized and evaluated for their ability to inhibit squalene synthase in vitro. A 9H-fluorene moiety was found to be optimal as the tricyclic system for potent inhibitory activity. Improved activity can be achieved with a conformationally constrained three-atom linkage connecting the tricyclic system with the quinuclidine nucleus
角鲨烯合酶(EC 2.5.1.21)催化两个分子法呢基二磷酸的还原性二聚化以形成角鲨烯,并参与胆固醇生物合成的第一步。因此,该酶的抑制是降胆固醇策略的有吸引力的靶标。合成了一系列引入三环系统的奎尼丁衍生物,并对其体外抑制角鲨烯合酶的能力进行了评估。发现9H-芴部分最适合作为有效抑制活性的三环系统。通过将三环系统与奎宁环核连接的构象约束的三原子键可以实现更高的活性。在这些化合物中,发现(Z)-3- [2-(9H-芴-2-基氧基)亚乙基]-奎宁环盐酸盐31是一种有效的角鲨烯合酶抑制剂,其衍生自仓鼠肝脏和人肝癌细胞,IC(50)值为76和分别为48 nM。口服化合物31显示出仓鼠血浆中非HDL胆固醇水平的有效降低。