A series of 5-aryl-1,2-dithiolethiones and 5-aryl-1,2-dithiole-3-ones were investigated as hydrogen sulfide-releasing anti-inflammatory drugs. Generally, phenolic acetophenones were best protected by methoxymethyl groups and the dithiolethione group installed by treatment with carbon disulfide, hexamethyldisilathiane, and hexachloroethane. However, ether-protected acetophenones could be elaborated to β-keto esters and converted to dithiolethiones by treatment with phosphorus pentasulfide and elemental sulfur. Dethionation of dithiolethiones to 1,2-dithiole-3-ones was accomplished by mercury(ii)-promoted hydrolysis. A preliminary investigation of the dithiolethiones and dithiole-3-ones as inhibitors of cyclooxygenases COX-1 and COX-2 is discussed. Dithiolethiones bearing a 5-(2,6-di-tert-butyl-4-hydroxyphenyl) or 5-(2,6-di-tert-butyl-4-methoxyphenyl) substituent were the most effective inhibitors of COX-2 and displayed excellent selectivity against COX-1, comparable with rofecoxib, a representative coxib. It is shown that uncatalyzed hydrolysis of the thiocarbonyl group to release hydrogen sulfide leads to the corresponding carbonyl compound, and these carbonyl compounds are moderate COX-2 selective inhibitors.
研究人员对一系列 5-芳基-1,2-二
硫代
硫酮和 5-芳基-1,2-二
硫代
硫酮-3-酮作为释放
硫化氢的消炎药进行了研究。一般来说,通过
二硫化碳、六甲基二
硅烷和
六氯乙烷的处理,
酚类苯乙酮得到甲氧基甲基基团和二
硫代乙酮基团的最佳保护。然而,醚保护的
苯乙酮可以被加工成 β-
酮酯,并通过五
硫化二
磷和元素
硫处理转化成二
硫代
硫酮。二
硫代
乙硫醚通过
汞(ii)促进的
水解作用脱
硫成 1,2-二
硫代-3-酮。本文讨论了二
硫代
硫醚和二
硫代-3-酮作为环氧化酶 COX-1 和 COX-2
抑制剂的初步研究。具有 5-(2,6-二叔丁基-
4-羟基苯基)或 5-(2,6-二叔丁基-4-
甲氧基苯基)取代基的二
硫代
硫iones 是 COX-2 最有效的
抑制剂,并且对 COX-1 具有极佳的选择性,可与具有代表性的 Coxib
罗非昔布相媲美。研究表明,
硫代羰基在未催化的情况下
水解释放出
硫化氢会生成相应的羰基化合物,而这些羰基化合物是中度的 COX-2 选择性
抑制剂。