Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (6): 1002-1007.doi: 10.1007/s40242-019-9137-y

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K3PO4-promoted Cyclopropanation of Electron-deficient Alkenes with 2-Bromo-1,3-propanedione Compounds

CHEN Zhanguo, WEN Ting, HOU Dan   

  1. Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, P. R. China
  • Received:2019-05-17 Revised:2019-07-09 Online:2019-12-01 Published:2019-11-29
  • Contact: CHEN Zhanguo E-mail:chzhg@snnu.edu.cn
  • Supported by:
    Supported by the Natural Science Foundation of Shaanxi Province, China(No.2009JM2001) and the Innovation Foundation of Postgraduate Cultivation of Shaanxi Normal University, China(No.2008CXB009).

Abstract: An easy and efficient method for the synthesis of multisubstituted cyclopropane derivatives from electron-deficicent alkenes with 2-bromo-1,3-propanedione compounds was described. For this method, ethyl α-cyanocinnamate derivatives 1 and β,β-dicyanostyrene derivatives 4 can all smoothly react with 2-bromo-1,3-propanedione compounds 2 to afford the corresponding multisubstituted cyclopropane derivatives 3 and 5 in good to excellent yields(up to 100%) promoted by anhydrous K3PO4 in DMF at room temperature, respectively. A possible mechanism of this reaction was proposed. Structures of all the products were confirmed by 1H NMR, 13C NMR and HRMS.

Key words: Cyclopropanation, Multisubstituted cyclopropane derivative, Electron-deficicent alkene, 2-Bromo-1,3-propanedione compound