Synthesis 2024; 56(19): 3074-3082
DOI: 10.1055/a-2352-7116
paper

The Addition of α-Hydroxy-benzylphosphonates to Dialkyl Acetyl­enedicarboxylates; Catalytic Hydrogenation of the Adducts

Authors

  • Mátyás Milen

    a   Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1111 Budapest, Műegyetem rkp. 3, Hungary
    b   Egis Pharmaceuticals Plc., Chemical Research Division, 1475 Budapest, PO Box 100, Hungary
  • Cintia Bese

    a   Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1111 Budapest, Műegyetem rkp. 3, Hungary
  • Csenge Kovács

    a   Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1111 Budapest, Műegyetem rkp. 3, Hungary
  • András Dancsó

    b   Egis Pharmaceuticals Plc., Chemical Research Division, 1475 Budapest, PO Box 100, Hungary
  • György Keglevich

    a   Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1111 Budapest, Műegyetem rkp. 3, Hungary

This project was supported by the National Research, Development and Innovation Office, Hungary (K134318).


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Abstract

α-Hydroxy-benzylphosphonates obtained by the Pudovik reaction of substituted benzaldehydes and dialkyl phosphites were added to the triple bond of dialkyl acetylenedicarboxylates. Optimum conditions involved a 24 hours stirring in the presence of 10% diazabicycloundecene in dichloromethane to afford the adducts as a mixture of predominant E- and a minor Z-isomers in 75–90% yields after flash chromatography. The structures of the geometrical isomers were confirmed by NOE- and ROE-measurements. Catalytic hydrogenation of the olefinic moiety of the adducts led to the diastereoisomers of corresponding saturated derivatives.

Supporting Information



Publication History

Received: 24 May 2024

Accepted after revision: 25 June 2024

Accepted Manuscript online:
25 June 2024

Article published online:
18 July 2024

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