NH3(CH2)6NH3SiF6 catalyzed highly efficient synthesis of benzimidazoles, benzoxazoles, benzothiazoles, quinoxalines and pyrimidin-2-ones/thiones

Herein, we describe a simple, highly efficient and environmentally friendly protocol for the synthesis of benzimidazoles, benzoxazoles, benzothiazoles,  3,4-dihydropyrimidin-2-ones/ thiones and quinoxalines derivatives using hybrid crystal NH3(CH2)6NH3SiF6 as a catalyst. Use of recyclable catalyst, easy work-up procedure, excellent yields, short reaction times and scalability are the important practical features of the present protocol

Valorization of the Phosphate Fertilizers Catalytic Activity in 1-(Benzothiazolylamino) Methyl-2-Naphthol Derivatives Synthesis

The present work focused on developing a new protocol of the 1-(benzothiazolylamino) methyl-2-naphthol derivatives synthesis by condensation of three compounds, i.e. aromatic 2-naphthol, 2-aminobenzothiazole and aldehyde. Furthermore, this reaction was carried out in the presence of three heterogeneous phosphate catalysts: monoammonium phosphates (MAP), diammonium phosphate (DAP), and trisuperphosphate (TSP). Moreover, this method offered many advantages, such as: very high yields, shorter reaction times, and the catalysts, can be easily recovered and reused without any loss of their catalytic activities.  Copyright ©2019 BCREC Group. All rights reserve

An Effective Method to Synthesize 2,3-Dihydroquinazolin-4(1H)-One Using Phosphate Fertilizers (MAP, DAP and TSP) as Green Heterogeneous Catalysts

In this work, an efficient, easy, and green process has been developed for the synthesis of 2,3-dihydroquinazolin-4(1H)-one from a condensation reaction of anthranylamide with various aromatic aldehyde using of phosphate fertilizers, mono-ammonium phosphate (MAP), di-ammonium phosphate (DAP) and triple superphosphate (TSP) as heterogeneous catalysts. The reaction conditions were optimized taking into account of some parameters which control the reaction, namely the nature and the volume of the solvent and the mass of catalyst. The results show that the catalysts used herein are very interesting because they present a good catalytic activity and they are reusable for at least five cycles without any degradation of their activity

A new process for Na 2 Ca(HPO 4 ) 2 synthesis and its application as a heterogeneous catalyst in Knoevenagel condensation

International audienceThe novelty of this work is to propose a new process consisting to the modification of triple superphosphate (TSP) by sodium nitrate (NaNO3) for the preparation of a heterogeneous catalytic support Na 2 Ca(HPO 4 ) 2 (calcium hydrogen disodium phosphate). This product has been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and infrared spectroscopy (IR). The catalytic activity of Na 2 Ca(HPO 4 ) 2 was examined in Knoevenagel condensation between 4-chlorobenzaldehyde and malononit rile as a model reaction. The optimization of the reaction operating conditions was carried out based on a study of the effect of various parameters, namely reaction time, the catalyst charge, the nature, and volume of solvent on the reaction yield. From these considerations, this catalyst proves its efficiency since it allows to obtain the product with excellent yields in a short reaction time. Moreover, it has been reused several times without any significant loss of its activity. The process developed herein can be considered as an ecological and economical method because the catalyst used is non-toxic, cost-effective and easy to prepare. © Mediterr.J.Chem., 2018