Silica sulfuric acid / ethylene glycol: An Efficient Eco-friendly Catalyst for One-pot Synthesis of Tricyclic and Tetarcyclic Dihydropyrimidine Derivatives. | ||
| Egyptian Journal of Chemistry | ||
| Article 8, Volume 62, Issue 12, December 2019, Pages 2265-2276 PDF (1.26 M) | ||
| Document Type: Review Articles | ||
| DOI: 10.21608/ejchem.2019.13142.1827 | ||
| Authors | ||
| Nagwa Abdelazeem* 1; Wahid Basyouni1; Samir Abbas1; Khairy El-Bayouki1; Mohamed El-kady2 | ||
| 1Organometallic and Organometalloid Chemistry Department, National Research Centre, Cairo, Egypt. | ||
| 2Chemistry Department, Faculty of Science, Ain Shams University | ||
| Abstract | ||
| A simple and efficient eco-friendly chemical procedures were developed for the synthesis of series of tricyclic and tetarcyclic dihydropyrimidine derivatives in excellent yields via a one-pot, multi-component reaction in the presence of silica sulfuric acid / ethylene glycol catalyst. The Tricyclic dihydropyrimidine derivatives 1a-g (benzo[4,5]imidazo[1,2-a]pyrimidine derivatives) were synthesized in high yields and high purity with short reaction times by reacting 2-aminobenzimidazole, aldehydes and ethyl acetoacetate. Also, the tetracyclic dihydropyrimidine derivatives 3a-f (benzo[4,5]imidazo[1,2-a]pyrimido[4,5-d]pyrimidin-4(1H)-one derivatives) were synthesized by the reaction of 2-aminobenzimidazole, aldehydes and cyanoacetamide. This present new protocol offers shorter reaction time, high yields and low cost. This method provides much improved protocol over the existing methods. | ||
| Keywords | ||
| Silica sulfuric acid/ethylene glycol; Dihydropyrimidine derivatives Benzo[4,5]imidazo[1,2-a]pyrimidine; 2-Aminobenzimidazole | ||
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