**2. Materials and method**

All chemicals were purchased from Merck and Aldrich and used as received. Melting points were recorded in open capillaries.1 H NMR were recorded on a Bruker Bio-Spin spectrometer at 400 MHz using TMS as an internal standard (in CDCl3). Mass spectra ESIMS were recorded and IR spectra were recorded on a Shimadzu FTIR spectrometer in KBr pallets.
