Chiral DNA Gyrase Inhibitors. 3. Probing the Chiral Preference of the Active Site of DNA Gyrase. Synthesis of 10-Fluoro-6-methyl-6,7-dihydro-9-piperazinyl- 2<i>H</i>-benzo[<i>a</i>]quinolizin-20-one-3-carboxylic Acid Analogues
作者:Robert A. Fecik、Pratik Devasthale、Segaran Pillai、Ali Keschavarz-Shokri、Linus Shen、Lester A. Mitscher
DOI:10.1021/jm0401356
日期:2005.2.1
R-6-methyl-6,7-dihydro-2H-benzo[a]quinolizin-2-one-3-carboxylic acids (12 and 22) were synthesized by an unambiguous route from optically active norephedrines, and their antibacterial potencies were measured. Against Gram-negative microorganisms and DNA gyrase a preference for S-absolute configuration was found whereas R-absolute stereochemistry was more active against Gram-positives. These results are in
为了寻求明显的文献异常,通过明确的途径合成了S-和R-6-甲基-6,7-二氢-2H-苯并[a]喹啉锌-2-酮-3-羧酸(12和22)。从旋光性去氧麻黄碱中提取,并测定其抗菌效力。针对革兰氏阴性微生物和DNA促旋酶,人们发现偏爱S-绝对构型,而R-绝对立体化学对革兰氏阳性更为活跃。这些结果与先前的报告有部分冲突。为了增强效力,通过新颖的途径合成了外消旋的10-氟-9-哌嗪基(35)和相关类似物。令人惊奇的是,后者的类似物的效力没有得到改善。简要讨论了这些发现的含义。