Nonbenzamidine isoxazoline derivatives as factor Xa inhibitors
摘要:
Factor Xa (fXa) is an important serine protease in the blood coagulation cascade. Inhibition of fxa has emerged as an attractive target for potential therapeutic applications in the treatments of both arterial and venous thrombosis. Herein, we describe a series of non-benzamidine isoxazoline derivatives as fXa inhibitors. The chloroaniline group was found to be the most potent benzamidine mimic in this series. Chloroaniline 1 (ST368) has a K-i value of 1.5 nM against fXa and is highly selective for fXa relative to thrombin and trypsin. (C) 2003 Elsevier Science Ltd. All rights reserved.
The present application describes nitrogen containing heteroaromatics and derivatives thereof of formula I:
or pharmaceutically acceptable salt forms thereof, wherein rings D—E represent guanidine mimics, which are useful as inhibitors of factor Xa.
An efficient synthesis of some 6-substituted 4,8-diaza-3,3,9,9- tetramethylundeca-2,10-dione dioximes (propylene amine oximes, PnAOs): Ligands for 99mTc complexes used in structure distribution relationship (SDR) studies
作者:Palaniappa Nanjappan、Natarajan Raju、Kondareddiar Ramalingam、David P. Nowotnik
DOI:10.1016/s0040-4020(01)85336-9
日期:1994.1
Technetium complexes of the ligand PnAO [4,8-diaza-3,3,9,9-fetramethylundeca-2,10-dione dioximes (3)] are of interest as commercial radiopharmaceuticals. In general, PnAOs are synthesized by alkylation of a propylenediamine derivative with 3-chloro-3-methyl-2-nitrosobutane (2). This alkylation reaction proved to be low yielding. With modestly bulky substituents at the 2-position of 1,3-diaminopropane, little or none of the required PnAO was obtained. As a result, an alternative approach of the synthesis of PnAO was developed. This method involved the alkylation of the propylenediamine with 3-bromo-3-methylbutan-2-one (18) followed by oximation of the resulting diamine-diketone (19). By this method, PnAOs were prepared in goad yield, even with bulky C-2 substituents. Fourteen PnAO derivatives were prepared by this method. We also describe the syntheses of several new propylenediamine derivatives.