排序方式: 共有87条查询结果,搜索用时 171 毫秒
1.
Spiro-fused heterocycles were synthesized in good to high yields by a pseudo four-component reaction of an aldehyde, urea and a cyclic β-diester or a β-diamide such as Meldrum’s acid or barbituric acid derivatives using microwave irradiation under solvent-free conditions. 相似文献
2.
Ramin Ghahremanzadeh Ghaffar Hosseini Roya Akbarzadeh Ayoob Bazgir 《Journal of heterocyclic chemistry》2013,50(2):272-280
A novel reaction of isatins, 2‐cyanoacetamide, and cyclic 1,3‐diketones in ethanol was reported. The reaction gave the unexpected spirooxindole ethyl carboxylates in excellent yields and the spirooxindole carboxamide was not observed. 相似文献
3.
4.
A novel heterogeneous magnetic palladium nano‐biocatalyst was designed by utilizing Irish moss, a family of sulfated polysaccharides extracted from algae, as a natural biopolymer. This magnetic Irish moss decorated with palladium (Pd–Fe3O4@IM) to form a biomagnetic catalytic system was synthesized and well characterized by FT–IR analysis, X‐ray powder diffraction, field emission scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, atomic absorption spectroscopy and transmission electron microscopy. The catalyst was stable to air and moisture and displayed high catalytic activity in ligand‐free Suzuki–Miyaura cross‐coupling reactions conducted under green chemistry reaction conditions. The aromatic ketones are produced by the cross‐coupling reaction between acid chlorides and aryl boronic acid derivatives in high yields. 相似文献
5.
6.
Ezat Hamidi-Asl Jahan Bakhsh Raoof Abdolraoof Samadi Meibodi Zahra Haghnavaz Bazgir 《中国科学:化学(英文版)》2016,59(1):128-134
Celestine blue(CB)was introduced as a new electroactive indicator in DNA biosensors.The interaction of CB with DNA was investigated by electrochemical and spectroscopic methods.The effect of buffer kind and p H on the electrochemical behavior of CB was studied.The peak currents of CB were linearly related to DNA concentration in the range of 5.0×10~(-9) to 1.0×10~(-7)mol/L.The detection limit of this approach was 4.76×10~(-10) mol/L.Based on spectrometry data a hypochromic effect was observed in UV-Vis spectra of CB with increasing DNA concentration.The results illustrate the possible interaction mode between CB and DNA is electrostatic binding. 相似文献
7.
A convenient four-component synthesis of ferrocenyl tetrazoles by the reaction of ferrocenecarboxaldehyde, isocyanides, azidotrimethylsilane and alkyl or aryl amines in CH2Cl2 at room temperature is reported. 相似文献
8.
Zeinab Noroozi Tisseh Minoo Dabiri Mohsen Nobahar Hamid Reza Khavasi Ayoob Bazgir 《Tetrahedron》2012,68(6):1769-1773
An approach for the synthesis of new 5-substituted-tetrazoles via multi-component domino Knoevenagel condensation/1,3 dipolar cycloaddition reaction of carbonyl compounds, malononitrile and sodium azide in water without assistance of any catalyst has been reported. This general protocol provides a wide variety of 5-substituted 1H-tetrazoles in good yields under mild reaction conditions. 相似文献
9.
An efficient one‐pot four‐component protocol for the synthesis of imidazo[1,2‐a]pyridines was developed by condensing ethane‐1,2‐diamine ( 2 ), 1,1‐bis(methylthio)‐2‐nitroethene ( 1 ), aldehydes 3 , and activated methylene compounds in EtOH under reflux conditions (Tables 1–3). The features of this procedure are operational simplicity, good yields of products, in situ preparation of heterocyclic ketene aminals (HKA), and catalyst‐free conditions. 相似文献
10.
An efficient synthesis of new pharmaceutically relevant dioxopyrrolidines, spirobenzo thiazine-2,3′-chromans, and benzothiazepines via isocyanide-based multicomponent condensation reactions at room temperature is reported. This synthesis serves as a nice addition to group-assistant-purification (GAP) chemistry in which purification via chromatography and recrystallization can be avoided, and the pure products are obtained simply by washing the crude products with 95% ethanol. 相似文献