1. Chemistry Department, Faculty of Science, Minia University , Minia 61519 , Egypt
2. Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Deraya University , Minia , Egypt
3. Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Assiut University , Assiut 71526 , Egypt
4. Department of Chemistry, Faculty of Science, Kuwait University , P. O. Box 12613 , Safat 13060 , Kuwait