A Facile and Convenient Synthesis of 5,5-Dialkylthio- and 5-Alkyl(or Aryl)thio-2,4-pentadienoic Acids
作者:Masaru Hojo、Ryoichi Masuda、Etsuji Okada
DOI:10.1055/s-1991-26377
日期:——
The hydrolysis of 6,6-dialkylthio- and 6-alkyl(or aryl)thio-1,1,1-trifluoro-3,5-hexadien-2-ones 2, 5 with potassium hydroxide in ethanol proceeds quite easily to give the corresponding 2,4-pentadienoic acids 3, 6, respectively, in excellent yields. Bistrifluoroacetyl compounds 8,10a, b give corresponding monocarboxylic acids 6a, 3a, b in high yields, with accompanied monodecarboxylation.
用氢氧化钾在乙醇中水解 6,6-二烷基硫代和 6-烷基(或芳基)硫代-1,1,1-三氟-3,5-己二烯-2-酮 2 和 5,很容易分别得到相应的 2,4-戊二烯酸 3 和 6,收率极高。双三氟乙酰基化合物 8、10a、b 伴随着单羧化反应,可以高产率地得到相应的单羧酸 6a、3a、b。