Stereoselective Synthesis oftrans-β-Substituted γ-Ferrocenyl-γ-butyrolactones via Ammonium Ylides

trans-P-substituted gamma-ferrocenyl-gamma-butyrolactones were prepared via the reaction of quaternary ammonium salts with electron-deficient trisubstituted alkene 1 under the optimum conditions. Moderate to good yields and excellent trans stereoselectivity) were achieved for the new compounds 2-10. The X-ray crystal structure of 2a was determined and all the products were characterized by H-1 NMR, C-13 NMR, FAB-MS, IR and HRMS spectra.