Studies on 5-Lipoxygenase Inhibitors. II. Discovery, Optical Resolution and Enantioselective Synthesis of FR110302, a Highly Potent Non-redox Type 5-Lipoxygenase Inhibitor.
作者:Takumi YATABE、Hiroshi KAYAKIRI、Yoshio KAWAI、Teruo OKU、Hirokazu TANAKA
DOI:10.1248/cpb.46.1556
日期:——
A novel series of 2, 2-dialkyl-5-(2-quinolylmethoxy)-1, 2, 3, 4-tetrahydro-1-naphthols was synthesized and evaluated as 5-lipoxygenase (5-LO) inhibitors. Systematic optimization led to identification of several highly potent non-redox type 5-LO inhibitors with nanomolar IC50s as racemic mixtures. Optical resolution of racemate 50 indicated that its 5-LO inhibitory activity was enantiospecific and due to the (+)-enantiomer. An efficient synthetic route to the (+)-enantiomers via asymmetric reduction of tetralone intermediates was established. The best compound, (+)-2, 2-dibutyl-5-(2-quinolylmethoxy)-1, 2, 3, 4-tetrahydro-1-naphthol (FR110302, (+)-50), showed potent inhibitory activity against leukotriene (LT) biosynthesis by intact neutrophiles in rats (IC50 4.9nM) and in humans (IC50 40 nM). Furthermore oral administration of FR110302 significantly inhibited neutrophil migration in the rat air pouch model at 1 mg/kg.
合成了一系列新型 2,2-二烷基-5-(2-喹啉甲氧基)-1,2,3,4-四氢-1-萘酚,并将其作为 5-脂氧合酶(5-LO)抑制剂进行了评估。通过系统优化,确定了几种外消旋混合物具有纳摩尔 IC50 值的高效非氧化还原型 5-LO 抑制剂。外消旋物 50 的光学分辨率表明,它的 5-LO 抑制活性是对映体特异性的,是(+)-对映体产生的。通过四氢萘酮中间体的不对称还原,建立了一条获得(+)-对映体的有效合成路线。最佳化合物(+)-2, 2-二丁基-5-(2-喹啉甲氧基)-1, 2, 3, 4-四氢-1-萘酚(FR110302,(+)-50)对大鼠(IC50 4.9nM)和人类(IC50 40 nM)完整中性粒细胞的白三烯(LT)生物合成具有强效抑制活性。此外,在大鼠气囊模型中,口服 1 毫克/公斤的 FR110302 可明显抑制中性粒细胞的迁移。