已经制备了一系列的2-芳基硫代甲基丙烯酸酯(2)和2-芳氧基-乙酰乙酸甲酯(3),并且通过1 H NMR光谱检查了它们的互变异构平衡。α位上的S取代导致烯醇互变异构体的增加超过90%,而O类似物主要以酮形式存在(表1)。在苯甲醇(1:1)溶液中对2-芳基硫基化合物2a-1进行耐热玻璃过滤辐照,得到的苯并噻吩衍生物(6a–f,7–10)除2j和2k以外均具有合理的收率,但不会发生光环化,仅观察到聚合物形成。O-类似物3b和3c的类似辐照在这些条件下,分别以相当低的收率得到呋喃衍生物17和18,而在光惰性条件下得到3a。通过仅提供萘[2,1-b]异构体的2-萘基衍生物(2h和3c)的反应揭示了光环化的区域特异性。还讨论了合理的反应机理。
Isoxazoline and isoxazole fibrinogen receptor antagonists
申请人:The DuPont Merck Pharmaceutical Company
公开号:US05849736A1
公开(公告)日:1998-12-15
This invention relates to novel isoxazolines and isoxazoles which are useful as antagonists of the platelet glycoprotein IIb/IIIa fibrinogen receptor complex or the vitronectin receptor, to pharmaceutical compositions containing such compounds, processes for preparing such compounds, and to methods of using these compounds, alone or in combination with other therapeutic agents, for the inhibition of platelet aggregation, as thrombolytics, and/or for the treatment of thromboembolic disorders.
Enantiospecific synthesis of optically pure (3s)-hydroxy esters by the stereocontrolled yeast reduction of α-sulfenyl-β-ketoesters
作者:Tamotsu Fujisawa、Toshiyuki Itoh、Toshio Sato
DOI:10.1016/s0040-4039(01)91125-6
日期:——
Stereocontrol in Baker's yeast reduction of β-ketoesters was successfully achieved by introducing the sulfenyl group at α-position of the esters to afford opticallypure (S)-β-hydroxy esters.
Highly stabilized sulfonium diacethylides (1a-c) reacted with acetyl chloride to give a mixture of the enol acetates (2a-c) and the enol diacetates (3a-c). Similarly, sulfonium acetylcarbomethoxymethylides (5a, b) gave the enol acetates (6a, b). These enol acetates were hydropyzed with HCl-MeOH to give 3-methylthio- (3-phenylthio-)2, 4-pentanediones (4a, b) or methyl 2-methylthio- (2-phenylthio-)acetoacetates (7a, b).
Disilyloxydienes (2a-c) were easily obtained by treatment of stable sulfur yliders (1a-c) with chlorotrimethylsilane in the presence of triethylamine. Cycloaddition reaction of these dienes with some dienophiles was carried out.
[EN] NOVEL ISOXAZOLINE AND ISOXAZOLE FIBRINOGEN RECEPTOR ANTAGONISTS<br/>[FR] NOUVEAUX ANTAGONISTES DE RECEPTEUR DE FIBRINOGENE, A BASE D'ISOXAZOLINE ET D'ISOXAZOLE
申请人:THE DU PONT MERCK PHARMACEUTICAL COMPANY
公开号:WO1995014683A1
公开(公告)日:1995-06-01
(EN) This invention relates to novel isoxazolines and isoxazoles which are useful as antagonists of the platelet glycoprotein IIb/IIIa fibrinogen receptor complex, to pharmaceutical compositions containing such compounds, processes for preparing such compounds, and to methods of using these compounds, alone or in combination with other therapeutic agents, for the inhibition of platelet aggregation, as thrombolytics and/or for the treatment of thromboembolic disorders.(FR) L'invention se rapporte à de nouveaux isoxazoles et isoxazolines aptes à être utilisés comme antagonistes du complexe récepteur de fibrinogène/glycoprotéine plaquettaire IIb/IIIa, à des compositions pharmaceutiques contenant ces composés, à des procédés de préparation de ces derniers ainsi qu'à des procédés permettant de les utiliser, seuls ou en combinaison avec d'autres agents thérapeutiques, comme agents thrombolytiques pour inhiber l'agrégation plaquettaire, et/ou pour le traitement de troubles thromboemboliques.