K3PO4-Promoted Cyclopropanation of Electron-deficient Alkenes with 2-Bromo-1,3-Propanedione Compounds
Zhanguo Chen , Ting Wen , Dan Hou
Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (6) : 1002 -1007.
K3PO4-Promoted Cyclopropanation of Electron-deficient Alkenes with 2-Bromo-1,3-Propanedione Compounds
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 reacted 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.
Cyclopropanation / Multisubstituted cyclopropane derivative / Electron-deficicent alkene / 2-Bromo-1,3-propanedione compound
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