排序方式: 共有17条查询结果,搜索用时 4 毫秒
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Thiocarbonyldiimidazole has been found to be an efficient acid activator for the synthesis of β-lactams by ketene-imine cycloaddition at room temperature. The experimental procedure is simple and results in excellent yields of the products. All products were characterized by spectral data and elemental analyses. 相似文献
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Mohammed M. Hashemi Hossein Ghafuri Zahed Karimi-Jaberi 《Monatshefte für Chemie / Chemical Monthly》2006,137(2):197-200
Summary. Various alkyl, aryl, and heterocyclic Hantzsch 1,4-dihydropyridines were converted to the corresponding pyridines in excellent yields and short times using sodium nitrite
in the presence of a catalytic amount of acidic silica gel at room temperature. 相似文献
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<正>Sodium dihydrogen phosphate(NaH_2PO_4) efficiently catalyzes the condensation reaction of benzil,aldehydes,amines and ammonium acetate in a four-component reaction under solvent-free conditions.The reaction proceeds rapidly and affords the corresponding tetra-substituted imidazoles in high yields.Also an efficient route was developed for the synthesis of tri-substituted imidazoles from condensation of benzil,aldehydes and ammonium acetate using NaH_2PO_4. 相似文献
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<正>Boric acid efficiently catalysed the one-pot reaction of alkyl or aryl aldehydes with 2-naphthol to afford the corresponding 14- alkyl-or aryl-14H-dibenzo[a,j]xanthenes in good yields under solvent-free conditions. 相似文献
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Zahed Karimi-Jaberi Mohammed M. Hashemi 《Monatshefte für Chemie / Chemical Monthly》2008,14(1):605-608
A simple and environmentally benign procedure for the synthesis of 14-alkyl- or aryl-14H-dibenzo[a,j]xanthenes is described through a one-pot condensation of 2-naphthol with aryl or alkyl aldehydes in the presence of sodium
hydrogen sulfate as a catalyst under solvent-free conditions. 相似文献
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Karimi-Jaberi Zahed Moaddeli Mohammad Sadegh Setoodehkhah Moslem Nazarifar Mohammad Reza 《Research on Chemical Intermediates》2016,42(5):4641-4650
Research on Chemical Intermediates - A clean, efficient and eco-friendly procedure has been developed using nano-copper chromite (nano-CuCr2O4) as catalyst for the synthesis of biscoumarin and... 相似文献
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Mohammed M. Hashemi Dadkhoda Ghazanfari Zahed Karimi-Jaberi 《Monatshefte für Chemie / Chemical Monthly》2004,135(2):185-188
Summary. 4-Aminoperoxybenzoic acid supported on silica gel in presence of oxygen or air was found to be a convenient and selective oxidant for the oxidation of benzylic methylene compounds to the corresponding ketones. 相似文献
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α, α’-Benzylidene bis(4-hydroxycoumarin) derivatives were readily prepared in a few minutes with good yields through the reaction of an aromatic aldehyde and 4-hydroxycoumarin in aqueous media in the presence of catalytic tris(hydrogensulfato) boron [B(HSO4)3]. 相似文献