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All the substances were purchased from Aldrich and Flulka and used without further purification. Melting points were measured on an electrothermal gallenkamp melting point apparatus and are uncorrected. The 1 H and 13 C NMR spectra were recorded in DMSO-d6 with tetramethylsilane (TMS) as an internal standard using 300 MHz Varian Gemini spectrometer. The IR spectra were measured on a Fourier Transform and Pye Unicam Infrared spectrophotometers by potassium bromide wafer. Mass spectra were recorded on a GCMS-QP 1000 EX spectrometer at an ionizing potential of 70 eV. Electronic absorption spectra were recorded on Perkin-Elmer Lambada 40 spectrophotometer.

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