Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (6): 1179-1186.DOI: 10.1016/S1872-2067(12)60527-0

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Sequential Ag-catalyzed carboxylative coupling/Ru-catalyzed cross-metathesis reactions for the synthesis of functionalized 2-alkynoates

ZHANG Linlin, ZHANG Wenzhen, SHI Linglong, REN Xiang, Lü Xiaobing   

  1. State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, Liaoning China
  • Received:2012-12-07 Revised:2013-01-07 Online:2013-06-07 Published:2013-06-09
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (20802007, 21111120073), the Fundamental Research Funds for the Central Universities (DUT12LK47), and the Scientific Research Fund of Liaoning Provincial Education Department (L2012024).

Abstract:

Sequential reactions can provide efficient access to a variety of important organic compounds that would be otherwise difficult to obtain using conventional methods and readily available starting materials. Based on the importance of 2-alkynoates in organic synthesis, the current research aimed to develop a method for the convenient synthesis of functionalized 2-alkynoates from terminal alkynes, CO2, terminal alkene-derived bromides, and methyl acrylate using a combination of the carboxylative coupling and cross-metathesis reactions. The initial ligand-free silver-catalyzed carboxylative coupling reactions of a variety of different aryl-substituted terminal alkynes and CO2 with 5-bromopentene and 6-bromohexene provided a series of 4-pentenyl 2-alkynoates and 5-hexenyl 2-alkynoates, respectively, in good yield. These resulting 2-alkynoates were further transformed into methyl (E)-6-acetylenecarboxy-2-hexenoates and (E)-7-acetylenecarboxy-2-heptenoates in moderate to good yields by their cross-metathesis reactions with methyl acrylate in the presence of the Grubbs-Hoveyda catalyst. All of the new products characterized spectroscopically.

Key words: Carbon dioxide, Carboxylative coupling, Silver catalyst, Cross-metathesis, Grubbs-Hoveyda catalyst, Homogeneous catalysis