可通过PPE促进由水杨酸甲酯和乙基5制成的5-(2'-羧基-苯氧基)呋喃-2-羧酸(8)的环化反应,方便地制备Furo [2,3- b ]色酮(1a)。-硝基呋喃-2-羧酸酯。通过类似的环化反应获得呋喃[2,3 - b ]发色-2-丙烯酸(13)。1a的直接酰化得到2-乙酰基呋喃[2,3- b ]色酮(10)。发现呋喃[2,3- b ]色酮的几种衍生物在大鼠被动皮肤过敏反应(PGA)测试中显示抗过敏活性。
Synthesis and Structural Pattern Recognition of 5-(2'-Alkoxycarbonyl-substituted phenoxy)furfural Derivatives
作者:Chia-Lin Chang
DOI:10.1248/cpb.57.550
日期:——
The ethyl 5-(2′-alkoxycarbonyl-substituted phenoxy)furan-2-carboxylates (1C—13C) showed good anti-platelet aggregation,1) anti-allergic2) and anti-inflammatory activities.2) A series of 5-(2′-alkoxycarbonyl-substituted phenoxy)furfurals (1F—13F) were prepared for comparing the above activities. The objectives of this research are the synthesis and structural pattern recognition of compounds 1F—13F. The Silica Gel 60 column chromatography method was employed to separate and purify pure compounds 1F—13F by three solvent systems. For the structure elucidation of compounds 1F—13F, four spectroscopic methods were used: electron impact mass (EI-MS), UV–VIS, IR and NMR spectrometers. With the help of spectrometers, investigations can be performed on spectroscopic data. A simple methodology for recognizing structural patterns was carried out with the aid of statistical analysis designed to establish the classification model of the structural skeleton in this research. It was found that compounds 1C—13C and 1F—13F have similar chemical profiles and are clustered into one group. The pattern plots revealed valuable information and showed good correlation between compounds 1C—13C and 1F—13F. These findings correlate directly with the resulting spectroscopic data. These results with those obtained by EI-MS and NMR patterns give insight into a reliable pattern recognition for determining both 1C—13C and 1F—13F skeletons.
Phenyl furyl sulfides (3a-j) and phenyl furyl ethers (3k-n), which are useful in synthesizing furocondensed 3-ring compounds, can be synthesized by nucleophilic substitution of nitrofurans having electron withdrawal groups. In our experiments using 5-nitrofurans having electron withdrawal groups (2a-i), nucleophilic substitution readily occurred with the benzenethiolate anion of thiosalicylic acid