Synthesis of 3-Trifluoromethyl- and 3-Perfluoroalkyl-Substituted 3-Aryloxy- and 3-Heteroaryloxypropenoic Acids and of the Cyclization Products, 2-Trifluoromethyl- and 2-Perfluoroalkyl-4H-chromen-4-ones
Novel Synthesis, Reactivity, and Stereochemistry of Substituted 3-Trifluoromethyl- and 3-Perfluoroalkyl-3-phenoxyprop-2-enal
作者:Salem El Kharrat、Philippe Laurent、Hubert Blancou
DOI:10.1021/jo060764i
日期:2006.9.1
Substituted 3-phenoxy-3-perfluoroalkylprop-2-enals 3a−s are synthesized in high yields starting from a gem-iodoacetoxy derivative 1 and phenoxides 2. Then efficient syntheses of push−pull derivatives 4, 5, 8a,b, and nonconjugated analogues 6 and 7 illustrate the synthetic potentialities of 3. Stereochemical studies of these perfluoroalkyl-containing trisubstituted olefinic derivatives 3−8b revealed
取代的3-苯氧基-3-全氟烷基丙-2-烯醛3a - s从宝石-碘乙酰氧基衍生物1和酚盐2开始高收率地合成。然后推挽衍生物的有效合成4,5,图8a,b,和非共轭类似物6和7示出的合成潜力3。这些含全氟烷基三取代的烯烃衍生物的立体化学研究,3 -图8b显示,4 Ĵ CF在13 C NMR光谱中观察到的偶合常数对于确定它们在溶液中的构型和构象至关重要。上推挽的立体化学溶剂极性效应的化合物3 - 5和图8a,b进行了研究。观察到异常的中等极性对亚氨基烯醇醚衍生物4的立体化学的影响。
Synthesis of 3-Trifluoromethyl- and 3-Perfluoroalkyl-Substituted 3-Aryloxy- and 3-Heteroaryloxypropenoic Acids and of the Cyclization Products, 2-Trifluoromethyl- and 2-Perfluoroalkyl-4<i>H</i>-chromen-4-ones
We describe a novel and simple method for the regiospecific synthesis of functionalized trifluoromethyl- and perfluoroalkyl-containing 4H-chromen-4-ones via the cyclization of substituted 3-aryloxy-3-perfluoroalkylpropenoic acids. The procedures give the final products in high yields, without any need for chromatographic purification, and no side products.