Organic chemistry
Masoud Mohammadi Zeydi; Mahdi Fouladi; Mahnaz Shamsi-Sani; Nosrat Ollah Mahmoodi
Abstract
In this work, Nano TiO2@KSF used as an efficient, homogeneous and reusable catalyst for the synthesis of pyrano[2,3-d]-pyrimidinone derivatives via three-component reactions between malononitrile, barbituric acid and various aldehydes in water. The products were formed in high yields within short reaction ...
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In this work, Nano TiO2@KSF used as an efficient, homogeneous and reusable catalyst for the synthesis of pyrano[2,3-d]-pyrimidinone derivatives via three-component reactions between malononitrile, barbituric acid and various aldehydes in water. The products were formed in high yields within short reaction times. Also, this catalyst can be reused several times without loss of its catalytic activity. All the products were characterized using melting point and a variety of techniques, including infrared spectra (FT-IR) and were compared with trusty references. This method a simple, efficient and green for the preparation of pyrano[2,3-d]pyrimidinone (4a-4l) derivatives using TiO2@KSF under mild conditions. The promising reasons for the presented method is efficiency, generality reaction profile, mild and green reaction conditions, easy work-up procedure, short reaction times and high yields of the products, ease of preparation.
Organic chemistry
Hojat Veisi; Abbas Maleki; Yasaman Farokhzad
Volume 5, Issue 2, pp. 121-236, Serial No. 15 , April 2017, , Pages 217-226
Abstract
An electroorganic reaction for the synthesis of 7-amino-2, 4-dioxo-5-phenyl-2,3,4,5-tetrahydro-1H-pyrano[2, 3-d] pyrimidine-6-carbonitrile and ethyl-7-amino-2, 4-dioxo-5-phenyl-2,3,4,5-tetrahydro-1H-pyrano[2, 3-d] pyrimidine-6-carboxylate derivatives are described, using an electrogenerated base of the ...
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An electroorganic reaction for the synthesis of 7-amino-2, 4-dioxo-5-phenyl-2,3,4,5-tetrahydro-1H-pyrano[2, 3-d] pyrimidine-6-carbonitrile and ethyl-7-amino-2, 4-dioxo-5-phenyl-2,3,4,5-tetrahydro-1H-pyrano[2, 3-d] pyrimidine-6-carboxylate derivatives are described, using an electrogenerated base of the anion of malonitrile or ethylcyanoacetate. This one-pot, three-component condensation of an aromatic aldehyde, barbituric acid and malonitrile or ethylcyanoacetate takes place in ethanol in an undivided cell in the presence of tetrabutylammonium perchlorate as an electrolyte under mild conditions. This method has the advantages of high yields, wide application and employs an environmentally benign procedure.An electroorganic reaction for the synthesis of 7-amino-2, 4-dioxo-5-phenyl-2,3,4,5-tetrahydro-1H-pyrano[2, 3-d] pyrimidine-6-carbonitrile and ethyl-7-amino-2, 4-dioxo-5-phenyl-2,3,4,5-tetrahydro-1H-pyrano[2, 3-d] pyrimidine-6-carboxylate derivatives are described, using an electrogenerated base of the anion of malonitrile or ethylcyanoacetate. This one-pot, three-component condensation of an aromatic aldehyde, barbituric acid and malonitrile or ethylcyanoacetate takes place in ethanol in an undivided cell in the presence of tetrabutylammonium perchlorate as an electrolyte under mild conditions. This method has the advantages of high yields, wide application and employs an environmentally benign procedure.
![Electron as potential and green catalyst in the multicomponent synthesis of pyrano [2, 3-d] pyrimidine derivatives](data/icc/coversheet/121465984392.png)
Organic chemistry
Vivekanand Jadhav; Mohasim M. Patel
Volume 5, Issue 1, pp. 1-120, Serial No. 14 , January 2017, , Pages 115-120
Abstract
Tetra-N-Butyl Ammonium Hydroxide was used as a catalyst for one-pot, three component condensation reactions consisting of aromatic aldehydes, malononitrile and barbituric acid in ethanol:water solvent system at 60oC. Current method has major advantages like mild reaction conditions with simple operation, ...
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Tetra-N-Butyl Ammonium Hydroxide was used as a catalyst for one-pot, three component condensation reactions consisting of aromatic aldehydes, malononitrile and barbituric acid in ethanol:water solvent system at 60oC. Current method has major advantages like mild reaction conditions with simple operation, high yields, by using a less toxic and lower costlier catalyst.In conclusion, we have explored nicely the synthetic utility of TBAOH as a commercially available, efficient, mild, straightforward, simple, environmentally and economically friendly organo-basic catalyst for the synthesis of diverse Pyrano[2,3-d]pyrimidinone derivtives. Thus we have developed a novel, simple and highly efficient one potmulticomponent reaction protocol for the synthesis of Pyrano[2,3-d]pyrimidinone derivtives in ethanol:water solvent system.
![Tetra-N-Butyl ammonium hydroxide mediated one-pot synthesis of pyrano [2, 3-d] pyrimidinone derivatives](data/icc/coversheet/291477726077.png)
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![Electron as potential and green catalyst in the multicomponent synthesis of pyrano [2, 3-d] pyrimidine derivatives](javascript:loadModal('Electron as potential and green catalyst in the mu ... ', 'data/icc/coversheet/121465984392.png'))
![Tetra-N-Butyl ammonium hydroxide mediated one-pot synthesis of pyrano [2, 3-d] pyrimidinone derivatives](javascript:loadModal('Tetra-N-Butyl ammonium hydroxide mediated one-pot ... ', 'data/icc/coversheet/291477726077.png'))