Synthesis of α-(Pentafluorosulfanyl)- and α-(Trifluoromethyl)-Substituted Carboxylic Acid Derivatives by Ireland–Claisen Rearrangement

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• 作者：Anna-Lena Dreier ; Bernd Beutel ; Christian Mück-LichtenfeldAndrej V. Matsnev ; Joseph S. ThrasherGünter Haufe
• 刊名：Journal of Organic Chemistry
• 出版年：2017
• 出版时间：February 3, 2017
• 年：2017
• 卷：82
• 期：3
• 页码：1638-1648
• 全文大小：557K
• ISSN：1520-6904

文摘

Earlier studies have shown that [3,3]-sigmatropic rearrangements of allyl esters are useful for the construction of fluorine-containing carboxylic acid derivatives. This paper describes the synthesis of 3-aryl-pent-4-enoic acid derivatives bearing either a pentafluorosulfanyl (SF₅) or a trifluoromethyl (CF₃) substituent in the 2-position by treatment of corresponding SF₅- or CF₃-acetates of p-substituted cinnamyl alcohols with triethylamine followed by trimethylsilyl triflate (TMSOTf). This Ireland–Claisen rearrangement delivered approximate 1:1 mixtures of syn/anti diastereoisomers due to tiny differences (<0.5 kcal/mol) both in the energy of (Z)/(E)-isomeric ester enolates and in the alternative Zimmerman–Traxler transition states of model compounds as shown by DFT calculations. Acidic reaction conditions have to be avoided since addition of the reagents in opposite sequence (first TMSOTf then Et₃N) led to oligomerization of the cinnamyl SF₅- and CF₃-acetates. Treatment of the corresponding regioisomeric 1-phenyl-prop-2-en-1-yl acetates under the latter conditions resulted in [1,3]-sigmatropic rearrangement and subsequent oligomerization of the intermediately formed cinnamyl esters. When Et₃N was added first followed by TMSOTf, no further reaction of the formed ester was detected.