All chemical reactions were done under nitrogen atmosphere and chromatographic purifications for the desired products were achieved by using silica gel 40-63 μm mesh. Mass spectra were recorded on an ESP-MALDI-FTICR instrument equipped with a 7T magnet (the instrument was calibrated using sodium trifluoroacetate cluster ions prior to acquiring the spectra). NMR spectra were recorded using a Bruker 500 MHz instrument equipped with a (noninverse) cryoprobe for 1 H; 125 MHz for C NMR using solvents including CDCl3, MeOD-d4 and DMSO-d6. TMS used as a reference in 1 H NMR and deuterated solvents in C NMR spectra and the chemical shift (δ) values were reported in ppm, coupling constants (J values) in hertz (Hz) and further splitting patterns were abbreviated as s = singlet, t = triplet, q = quartet, and m = multiplet.