Heteroarylacetyl Chlorides and Mixed Anhydrides as Intermediates in the Synthesis of Heterocyclic Dronic Acids
作者:Istvan Greiner
DOI:10.2174/157018012799859963
日期:2012.4.26
is no need for phosphorous acid during the conversion of 1-heteroarylacetic acids to the corresponding dronic acids, as phosphorus trichloride (PCl3) is the real reagent. We could prove that the first intermediate toward the formation Risedronic acid is 3-pyridylacetyl chloride that was prepared in different ways using inorganic halides in toluene or in methanesulfonic acid (MSA). The intermediate was
已经认识到,在1-杂芳酸转化为相应的丁二酸的过程中不需要亚磷酸,因为三氯化磷(PCl3)是真正的试剂。我们可以证明,形成Risedronic酸的第一个中间体是3-吡啶基乙酰氯,它是通过在甲苯或甲磺酸(MSA)中使用无机卤化物以不同方式制备的。然后使中间体与两当量的PCl3反应,以在水解和pH调节后提供利塞膦酸。吡啶基乙酰氯中间体根据其酯化和酰胺化反应进行鉴定。在作为溶剂的MSA中,也可能形成混合酸酐作为中间体,与PCl3反应可从中形成醛酸。