排序方式: 共有67条查询结果,搜索用时 15 毫秒
31.
A. Davoodnia M. Roshani S.H. Malaeke M. Bakavoli 《中国化学快报》2008,19(5):525-528
A rapid and efficient method for the synthesis of isoxazolo[5,4-d]pyrimidin-4(5H)-ones has been developed through cyclocondensation of 5-aminoisoxazole-4-carboxamides with orthoesters under conventional heating and solvent-free microwave irradiation with solid acid catalysis. In comparison, the reactions are faster and the yields are higher under microwave irradiation. 相似文献
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H. Eshghi M. Bakavoli H. Moradi A. Davoodnia 《Phosphorus, sulfur, and silicon and the related elements》2013,188(11):3110-3118
Fe(HSO4)3 has been used as a heterogeneous, efficient, and recyclable catalyst in ethanol for the selective oxidation of thiols to their corresponding disulfides. The same results were obtained under identical conditions using catalytic amounts of Fe(HSO4)3 in the presence of DMSO. Different types of aliphatic, aromatic, and heteroaromatic thiols have been used in the reaction, and in all cases the products were obtained in good to excellent yields. 相似文献
34.
Abolghasem Davoodnia Sadegh Allameh Samineh Fazli Niloofar Tavakoli-Hoseini 《Chemical Papers》2011,65(5):714-720
A convenient method for the synthesis of tetrahydrobenzo[b]pyrans by a one-pot three-component cyclocondensation of dimedone, aryl aldehydes, and malononitrile in water using silica
gel-supported polyphosphoric acid (PPA-SiO2) as an efficient and reusable catalyst is described. The present methodology offers several advantages, such as a simple
procedure with ease of handling, short reaction time, high yields, and the absence of any volatile and hazardous organic solvents. 相似文献
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M. Rahimizadeh A. Davoodnia M. M. Heravi M. Bakavoli 《Phosphorus, sulfur, and silicon and the related elements》2013,188(12):2923-2929
A simple and fast synthesis of 6-aryl-3-substituted-5H-[1,2,4]-triazolo[4,3-b][1,2,4]triazoles 4 in high yields has been developed by microwave assisted heterocyclization of N-(3-methylthio-5-substituted-4H-1,2,4-triazol-4-yl)benzenecarboximidamides 3 . The effectiveness of the microwave irradiation and conventional heating for the formation of compounds 4 has been investigated. 相似文献
36.
A simple and efficient catalytic protocol for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes via the one-pot condensation ofβ-naphthol and aryl aldehydes using silicotungstic acid(H4[SiW12O40]) is reported.The present method offers several advantages such as high to excellent yields,short reaction times,recovery and reusability of catalyst,mild reaction conditions and easy workup procedures. 相似文献
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Davoodnia Abolghasem Heravi Majid M. Rezaei-Daghigh Leila Tavakoli-Hoseini Niloofar 《中国化学》2010,28(3):429-433
A green and improved method for the synthesis of β‐amido ketones through one‐pot multi‐component reaction of an enolizable ketone, aryl aldehyde, acetonitrile or benzonitrile in the presence of trimethylsilyl chloride using 3‐methyl‐1‐(4‐sulfonic acid)butylimidazolium hydrogen sulfate [(CH2)4SO3HMIM][HSO4], a Br?nsted‐acidic ionic liquid, as an effective and recyclable catalyst is described. The present methodology offers several advantages such as simple procedure with an easy work‐up, relatively short reaction time, and good to excellent yields. 相似文献
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Majid M. Heravi Mina Saeedi Narges Karimi Masumeh Zakeri Yahya S. Beheshtiha Abolghasem Davoodnia 《合成通讯》2013,43(4):523-529
1-(4-Sulfonic acid)butyl-3-methylimidazolium hydrogen sulfate ([(CH2)4SO3HMIM][HSO4]) efficiently catalyzed a four-component Hantzsch reaction of aldehyde, ethylacetoacetate, dimedone, and ammonium acetate to afford the corresponding polyhydroquinoline derivatives. 相似文献
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A. Davoodnia A. Zare-Bidaki H. Eshghi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(12):2968-2973
A simple and fast method for the isolation of intermediates in the synthesis of 3-arylthieno[2,3-d]pyrimidine-2,4(1H,3H)-diones has been developed by microwave-assisted condensation of ethyl 2-amino-4,5-dimethylthiophene-3-carboxylate with aryl isocyanates. The intermediates, subsequently, underwent cyclization in t-butanol in the presence of potassium t-butoxide on heating to reflux to give the desired bicyclic products, 3-arylthieno[2,3-d]pyrimidine-2,4(1H,3H)-diones. 相似文献
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