β-keto esters were investigated as potential starting materials. The β-keto esters were brominated and cyclised with 2·5 N KOH as cyclising agent. Tetronic acid and seven derivatives including the naturally occuring carolinic acid were obtained. In a number of cases products arising from a Favorskii rearrangment were isolated. The NMR spectroscopic data are discussed.
为了改善和简化合成四氢
萘甲酸的合成途径,研究了15种不同取代的β-
酮酯作为潜在的原料。将β-
酮酸酯
溴化并用2·5 N KOH作为环化剂环化。获得了Tetronic酸和七种衍
生物,包括天然存在的卡罗琳酸。在许多情况下,都分离了由Favorskii重排产生的产品。讨论了NMR光谱数据。