Studies on the syntheses of 2(1H)-pyridone derivatives. II. Reactions of N-substituted 6-chloro-2(1H)-pyridones with ethylenediamine, 2-aminoethanethiol and related compounds.
作者:KAZUO KUBO、NORIKI ITO、YASUO ISOMURA、ISAO SOZU、HIROSHIGE HOMMA、MASUO MURAKAMI
DOI:10.1248/cpb.27.1207
日期:——
It has been found that Smiles rearrangement leading to N-p-chlorophenyl-6-β-hydroxyethylamino-4-phenyl-2 (1H)-pyridone (II) took place when 6-β-aminoethoxy-N-p-chlorophenyl-4-phenyl-2 (1H)-pyridone (III) was heated in acetic acid, and that the reaction of an N-substituted 6-chloro-4-phenyl-2 (1H)-pyridone (I) with ethylenediamine, 2-amino-ethanethiol or o-aminothiophenol gives condensed heterocyclic pyridones such as imidazopyridone (IV), thiazolopyridone (X) or benzothiazolopyridone (XV). This reaction is considered to proceed by ring transformation of an intermediate of the Smiles rearrangement. Some of these pyridone derivatives showed strong biological activities as analgesic and antiinflammatory agents.
研究发现,6-β-氨基乙氧基-N-氯苯基-4-苯基-2(1H)-吡啶酮(III)在乙酸中加热时,会发生 Smiles 重排反应,生成 N-对氯苯基-6-β-羟乙氨基-4-苯基-2(1H)-吡啶酮(II)、以及 N-取代的 6-氯-4-苯基-2(1H)-吡啶酮(I)与乙二胺、2-氨基乙硫醇或邻氨基苯硫酚反应,生成缩合杂环吡啶酮,如咪唑吡啶酮(IV)、噻唑吡啶酮(X)或苯并噻唑吡啶酮(XV)。这种反应被认为是通过斯迈尔斯重排中间体的环转化进行的。其中一些吡啶酮衍生物具有很强的镇痛和抗炎生物活性。