4418-61-5Relevant articles and documents
Rapidly, highly yielded and green synthesis of dihydrotetrazolo[1,5-a]pyrimidine derivatives in aqueous media using recoverable Pd (II) thiazole catalyst accelerated by ultrasonic: Computational studies
Abu-Dief, Ahmed M.,Alsoliemy, Amerah,El-Dabea, Tarek,El-Metwaly, Nashwa M.,El-Remaily, Mahmoud Abd El Aleem Ali Ali,Khalifa, Mohamed E.,Soliman, Ahmed M. M.
, (2021/07/02)
Here, we synthesized new thiazole complexes from Cu (II), Fe (III), and Pd (II) ions. Such complexes were characterized to present their chemical formulae, firstly. The octahedral geometry was suggested for the investigated complexes except Pd (II) complex (ARPTPd), which has a square-planer arrangement. ARPTPd was planned to be used as a catalyst for synthesis of dihydrotetrazolo[1,5-a]pyrimidine derivatives at mild conditions. The catalytic activity of ARPTPd complex in four-components reaction approach was deliberately monitored till it reaches the most favorable conditions. The advantages of suggested catalyst were basically summarized by using green solvent (H2O), lower reaction time, and high products yields. Also, the superiority of ARPTPd complex and ultrasonic irradiation towards synthesis of dihydrotetrazolo[1,5-a]pyrimidine derivatives was revealed compared with other Lewis acids, basic, and ionic liquid catalysts. Furthermore, the mildness of conversion and compatibility with different functional groups makes it attractive. In addition, in consecration, computational aspects were often taken according to their effect on the declaration or discrimination of variable functional characteristics. Crystal packing systems of complexes were configured to extract important surface properties. DFT study was also applied to explain the causes behind the superiorly of ARPTPd complex. Also, the optimization process for intermediates was executed to support the suggested mechanism. Finally, this simple, economical, and green catalytic procedure may be applied to the industry in future.
Production process of 5-aminotetrazole
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Paragraph 0017-0024, (2021/01/15)
The invention belongs to the technical field of chemical synthesis, and particularly discloses a production process of 5-aminotetrazole, which adopts the following synthesis route: aminoguanidine bicarbonate and sulfuric acid are adopted to generate aminoguanidine sulfate; diazotization reaction is carried out on aminoguanidine sulfate and sodium nitrite to generate amidine azide sulfate; and cyclization reaction is performed on the amidine azide sulfate under the action of ammonia water to generate the 5-amino tetrazole. The path is good in safety and few in byproducts; the invention also provides a specific process flow, the process is simple, the operation is easy, and the product yield is high; according to the invention, a high-purity 5-amino tetrazole finished product is obtained bystep-by-step conversion in the diazotization process, control of the addition mode of sodium nitrite and strict control of the temperature and pH in the diazotization and cyclization reaction processes.
Facile synthesis of tetrazolo[1,5-a]pyrimidine with the aid of an effective gallic acid nanomagnetic catalyst
Maleki, Ali,Niksefat, Maryam,Rahimi, Jamal,Azadegan, Sepide
, p. 103 - 110 (2019/05/06)
The present work is the first report of nano-Fe3O4@SiO2-NH-gallic acid in multicomponent reactions as a catalyst. One-pot condensation of various aromatic aldehydes, ?-ketoesters and 5-aminotetrazole to deliver the desired tetrazolo[1,5-a]pyrimidine derivatives is investigated. It involves successful surface modification of Fe3O4@SiO2-NH2 as a potent magnetic support with a well-known natural acid which attracts considerable interests because of its applications in different sciences. This reusable magnetically separable nanocatalyst provides a convenient and reliable method for high yield tetrazole derivatives synthesis in short reaction times with wide variety range of the products and facile isolation. Acid grafting on the surface of amine-functionalized silica-coated magnetic nanoparticles confirmed by Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and energy-dispersive X-ray (EDX) analysis techniques. Structural characterization included scanning electron microscopy (SEM) images along with transmission electron microscopy (TEM) images and vibrating sample magnetometer (VSM) curve applied for morphology and magnetism type determination of the resulted nanocatalyst, respectively.