A Novel Class of Platelet Activating Factor(PAF) Antagonists. II. Modification of the 2-Position of the Glycerol Backbone of PAF-Sulfonamide Isosteres.
作者:Tatsuo TSURI、Takeaki MATSUI、Nobuhiro HAGA、Susumu KAMATA、Sanji HAGISHITA、Kimio TAKAHASHI、Hisato KAKUSHI、Kiyohisa UCHIDA、Hisao HATAKEYAMA、Atsushi KUROSAWA
DOI:10.1248/cpb.40.85
日期:——
In a continuing effort to obtain more potent platelet activating factor (PAF) antagonists, we tried to synthesize a series of PAF-sulfonamide isosteres in which the substituent at the 2-position was modified to an acetoxy equivalent other than the methoxy group. These modifications produced highly active PAF antagonists. Compound 3-[2-(5-methyl 2H-tetrazol-2-yl)-3-(octadecylcarbamoyloxy)propylaminosulfonyl]propylquinolinium iodide (52) showed the most potent activity in the in vitro inhibitory effect on PAF-induced platelet aggregation in rabbit platelet-rich plasma (IC50=125nM) and also in the in vivo protective effect on PAF-induced lethality in mice, with prolonged duration of action. Optically active enantiomers of this compound were synthesized and the (S)-(-)-isomer (IC50=87nM) was found to be three times more potent that the (R)-(+)-isomer (IC50=289nM), clearly exemplifying the enantioselectivity in the PAF-antagonist action of this novel compound.
为了继续努力获得更有效的血小板活化因子(PAF)拮抗剂,我们尝试合成了一系列 PAF 磺酰胺异构体,其中 2 位的取代基被修饰为甲氧基以外的乙酰氧基。这些修饰产生了高活性的 PAF 拮抗剂。化合物 3-[2-(5-甲基 2H-四唑-2-基)-3-(十八烷基氨基甲酰氧基)丙基氨基磺酰基]丙基喹啉鎓碘化物(52)在体外对 PAF 诱导的兔血小板富集血浆中的血小板聚集具有抑制作用(IC50=125nM),在体内对 PAF 诱导的小鼠致死具有保护作用,且作用持续时间较长。研究人员合成了该化合物的光学活性对映体,发现(S)-(-)-异构体(IC50=87nM)的药效是(R)-(+)-异构体(IC50=289nM)的三倍,这清楚地证明了这种新型化合物在 PAF 拮抗剂作用中的对映体选择性。