Monocyclic pteridine analogs. Inhibition of Escherichia coli dihydropteroate synthase by 6-amino-5-nitrosoisocytosines
作者:O. William Lever、Lawrence N. Bell、H. Michael McGuire、Robert Ferone
DOI:10.1021/jm00150a019
日期:1985.12
inhibitors of dihydropteroatesynthase from Escherichia coli. A number of 6-(alkylamino)-5-nitrosoisocytosines have in vitro potency equivalent with or superior to that of therapeutically effective sulfonamide inhibitors of the synthase. The sulfonamide drugs are known to compete for the p-aminobenzoic acid binding site of the synthase, and kinetic analysis of inhibition of the synthase by 6-(methyl
Synthesis of 2-amino-2-deoxo-5-deazaflavins and related compounds
作者:Takeshi Aoyagi、Reiko Yanada、Kiyoshi Bessho、Fumio Yoneda、W. L. F. Armarego
DOI:10.1002/jhet.5570280611
日期:1991.10
10-Alkyl-2-amino-2-deoxo-5-deazaflavins were prepared by the condensation of 2-amino-6-chloro-5-formylpyrimidin-4(3H)-one with the corresponding N-alkylanilines. 2-Amino-10-p-tolyl-2-deoxo-5-deazaflavin was prepared by the condensation of 2-amino-6-p-toluidinopyrimidin-4(3H)-one with o-chlorobenzaldehyde. Some reactivities of 2-aminopyrimidin-4(3H)-ones are described.
metabolic stability of [18F]PPY1 and [18F]PPY2 in CD-1 mice by radio-HPLC analysis revealed parent fractions of more than 76% of total activity in the brain. Specific binding of [18F]PPY2 on mice brain slices was demonstrated by in vitro autoradiography. In vivo PET/magnetic resonance imaging (MRI) studies in CD-1 mice revealed a reasonable high initial brain uptake for both radiotracers, followed by a fast
腺苷A 2A受体(A 2A R)代表神经退行性疾病的潜在治疗靶标。为了开发正电子发射断层扫描(PET)示踪剂以监测A 2A R量身定制的治疗过程中受体密度和/或占有率的变化,我们基于最近发表的铅化合物(PPY)设计了一个氟化类似物库。其中,高亲和力的4-氟苄基衍生物(PPY1 ; K i(h A 2A R)= 5.3 nM)和2-氟苄基衍生物(PPY2 ; K i(h A 2A)从相应的硼酸频哪醇酯前体开始,通过醇增强的铜介导的方法,选择R)= 2.1 nM)进行18 F标记。的代谢稳定性的研究[ 18 F] PPY 1和[18 F] PPY2在通过放射性HPLC分析CD-1小鼠显示在脑的总活性的76%以上父级分。通过体外放射自显影证实了[ 18 F] PPY 2在小鼠脑片上的特异性结合。在CD-1小鼠中进行的体内PET /磁共振成像(MRI)研究表明,两种放射性示踪剂的初始脑摄取量均较高,然后快速清除。
Bell, Lawrence; McGuire, H. Michael; Freeman, G. Andrew, Journal of Heterocyclic Chemistry, 1983, vol. 20, p. 41 - 44
作者:Bell, Lawrence、McGuire, H. Michael、Freeman, G. Andrew