Fluoronaphthyridines and -quinolones as antibacterial agents. 5. Synthesis and antimicrobial activity of chiral 1-tert-butyl-6-fluoro-7-substituted-naphthyridones
摘要:
A series of novel 7-substituted-1-tert-butyl-6-fluoronaphthyridone-3-carboxylic acids has been prepared. These derivatives are characterized by chiral aminopyrrolidine substituents at the 7 position. In this paper we report the full details of the asymmetric synthesis of this series of compounds. Structure-activity relationship studies indicate that the absolute stereochemistry at the asymmetric centers of the pyrrolidine ring is critical for maintaining good activity. Compounds 60 and 61 (3-amino-4-methylpyrrolidine enantiomers) were selected for preclinical evaluation.
Co-ordination chemistry of 3S-aminopyrrolidine and 3S-(methylamino)pyrrolidine: crystallisation of the two diastereomers of dichloro[3S-(R,S-methylamino)pyrrolidine]palladium(II)
摘要:
我们制备了二价铜、镍、钯和铂与 3S-氨基吡咯烷(S-ap)的配合物,并结合核磁共振、CD、电子、红外和微分析技术对其进行了表征。选择的立体碳(S)的手性迫使仲氮在配位时采用 R 立体化学结构,5 元螯合物的构象为 λ。反式排列是在轴向供体(X = 卤化物、硫氰酸盐或亚硝酸盐)与五共价离子 [Cu(S-ap)2X]+ 配位后产生的。S-ap 的伯胺发生甲基化反应,在新配体 3S-(甲基氨基)吡咯烷(S-meap)中产生另一个仲氮中心。这种外环氮在配位时并不局限于单一构型。我们制备了[M(S-meap)Cl2]复合物,其中 M = Pd 或 Pt,并对其进行了表征。[Pd(S-meap)Cl2]的两种非对映异构体(R-和 S-NMe)都能从水溶液中结晶出来,形成不同的晶体,并能通过机械方法分离。通过 X 射线晶体学,确定了 NMe(R)异构体的结构。