N-acetyl-para-aminophenyl N'-acetylaminothioalkanoates I are new analgesic compounds with greatly reduced hepatotoxic effects, when taken in overdose, relative to N-acetyl-para-aminophenol. They are prepared by reacting an N-acetylaminothioalkanoic acid IV with a reactive organic chloride V to form a mixed anhydride II and then reacting the latter with N-acetyl-para-aminophenol. The mixed anhydrides II are new and useful intermediates. Alternatively the derivatives I may be prepared by reacting the acid IV with bis-(4-nitrophenyl) sulfite to form a para-nitrophenyl N-acetylaminothioalkanoic acid ester VIII, reducing the latter to a para-aminophenyl N-acetylaminothioalkanoate VII, and acetylating this product. The esters VII and VIII are new and useful intermediates. Both reactions may pass through S-blocked intermediates, which are also new. Pharmaceutical compositions containing the derivatives I are disclosed, and also analgesic methods using them.
N-乙酰基对
氨基苯基N'-乙酰
氨基
硫代烷酸酯I是一种新的镇痛化合物,与N-乙酰
对氨基苯酚相比,当过量使用时具有大大降低的肝毒性效果。它们是通过将N-乙酰
氨基
硫代烷酸IV与反应性有机
氯化物V反应形成混合酸酐II,然后将后者与N-乙酰
对氨基苯酚反应制备而成。混合酸酐II是新的有用中间体。或者,可以通过将酸IV与双-(4-
硝基苯基)亚
磺酸酯反应形成对
硝基苯基N-乙酰
氨基
硫代烷酸酯VIII,还原后者为对
氨基苯基N-乙酰
氨基
硫代烷酸酯VII,并对该产物进行乙酰化来制备衍
生物I。
酯类VII和VIII是新的有用中间体。这两种反应都可以通过S-阻断中间体进行,这也是新的。揭示了含有衍
生物I的制药组合物,以及使用它们的镇痛方法。