共查询到20条相似文献,搜索用时 421 毫秒
1.
C. Wang Y. Wan H.‐Y. Wang L.‐L. Zhao J.‐J. Shi X.‐X. Zhang H. Wu 《Journal of heterocyclic chemistry》2013,50(3):496-500
The efficient one‐pot syntheses of Betti bases by the three‐component reaction of aromatic aldehyde, 2‐naphthalen, and acetonitrile (or benzamide) catalyzed by 1‐methyl‐3‐(2‐(sulfooxy)ethyl)‐1H‐imidazol‐3‐ium chloride is reported. The solvent can be recycled easily. 相似文献
2.
Efficient One‐Pot Syntheses of 7‐Alkyl‐6H,7H‐naphtho[1,2:5,6]pyrano‐[3,2‐c]chromen‐6‐ones by 1‐Methyl‐3‐(2‐(sulfooxy)ethyl)‐1H‐imidazol‐3‐ium Chloride 下载免费PDF全文
Yu Wan Chao Wang Hai‐ying Wang Ling‐ling Zhao Xiao‐xiao Zhang Jing‐jing Shi Shu‐ying Huang Gui‐Xiang Liu Hui Wu 《Journal of heterocyclic chemistry》2014,51(5):1293-1297
An efficient synthesis of 7‐alkyl‐6H,7H‐naphtho‐[10,20:5,6]pyrano[3,2‐c]chromen‐6‐ones by three‐component condensation reaction of β‐naphthol, aromatic aldehydes, and 4‐hydroxycoumarin catalyzed by 1‐methyl‐3‐(2‐(sulfooxy)ethyl)‐1H‐imidazol‐3‐ium chloride is reported in good to excellent yields and short reaction times. 相似文献
3.
Jean‐Baptiste Gualtierotti Xavier Schumacher Dr. Patrice Fontaine Dr. Géraldine Masson Dr. Qian Wang Prof. Dr. Jieping Zhu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(46):14812-14819
Mild and general alumina‐promoted hydrolysis conditions for converting α‐iminonitriles into carboxamides have been developed. In combination with the oxidative three‐component Strecker reaction, the one‐pot direct amidation of aldehydes and alcohols is reported. Subsequently, an Yb(OTf)3‐catalyzed Michael addition of thiols to α,β‐unsaturated α‐iminonitriles is reported for the synthesis of β‐mercapto‐α‐iminonitriles. The successful integration of an oxidative Strecker reaction, thio‐Michael addition, and neutral‐alumina‐promoted hydrolysis of β‐mercapto‐α‐iminonitriles into a three‐component one‐pot process allowed us to develop the direct conversion of amines, aldehydes, and thiols into β‐mercaptoamides. All of these procedures were applicable to aromatic and aliphatic amines and aldehydes. 相似文献
4.
Liangce Rong Honglou Ji Sheng Xia Shan Yin Yanhui Shi Shujiang Tu 《Journal of heterocyclic chemistry》2012,49(3):696-699
A simple, efficient, and mild protocol for the synthesis of 4‐naphthylpyrimidin‐2‐amine derivatives under solvent‐free conditions by the reaction of aromatic aldehydes (or 1‐naphthaldehyde), 2‐acetylnaphthalene (or aromatic ketones), guanidine carbonate, and sodium hydroxide was reported. The advantages of this protocol include short reaction time, mild reaction conditions, easy workup, high yields, and environmental friendliness. 相似文献
5.
This study reported a method to prepare fully aromatic macrocycle‐terminated polyimides (MC‐PI). The macrocycle of aryl ether ketones was prepared from (4‐amino)phenylhydroquinone and a di‐fluoro monomer under pseudo high dilution condition. Novel aromatic fully MC‐PI oligomers were successfully prepared by the reaction of 2,3,3′,4′‐biphenyltetracarboxylic diandhydride with 2,5‐bis(4′‐aminophenoxy)‐biphenyl and sulfur‐containing macrocycle of aryl ether ketone. The MC‐PI oligomers were cross‐linkable in the heating, and the glass transition temperatures of the polyimides increased after thermally cured. The cross‐linking reaction of MC‐PI could form fully aromatic thermosetting polyimide by ring‐opening reaction. After cross‐linking, these polyimides showed higher glass transition temperatures and excellent thermal stability. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
6.
Silica Sulfuric Acid‐Catalyzed Five‐component Efficient Synthesis of Five‐Substituted Tetrahydropyridines 下载免费PDF全文
Xiao‐xiao Zhang Yu Wan Li‐ling Pang Hai‐ying Wang Ling‐ling Zhao Chao Wang Shu Ying Hang Gui Xiang Liu Liang‐Feng Chen Hui Wu 《Journal of heterocyclic chemistry》2014,51(2):442-449
A highly atom‐economic one‐pot synthesis of five‐substituted tetrahydropyridines via a five‐component condensation of two equivalents of aromatic aldehyde, two equivalents of aromatic aniline, and one equivalent of β‐keto ester catalyzed by silica sulfuric acid is reported. In this reaction, up to five new bonds and one new ring were formed in one pot with water as the only one by‐product. 相似文献
7.
We found that the trypsin from hog pancreas displayed high activity to promote three‐component Mannich reaction of aromatic aldehydes, aromatic amines, and acetone with moderate‐to‐excellent yields. The reaction tolerates a great range of substrates and extends the application of trypsin in organic synthesis. 相似文献
8.
Unexpected One‐pot Synthesis of Novel 2‐Aminopyrimidine‐4‐ones under Microwave Irradiation 下载免费PDF全文
One‐pot, three‐component condensation of guanidine, ethylbenzoylacetate and various aromatic aldehydes in the presence of NaHCO3 have been investigated by microwave irradiation. The aromatic aldehydes bearing electron‐withdrawing groups undergo condensation with guanidine and ethylbenzoyl‐acetate to afford ethyl‐2‐amino‐4‐aryl‐1,4‐dihydro‐6‐phenylpyrimidine‐5‐carboxylate derivatives via Biginelli reaction. However, reaction of the aromatic aldehydes having electron‐releasing groups with guanidine and ethylbenzoylacetate did not give the corresponding dihydropyrimidines. Instead, novel 2‐amino‐5‐benzoyl‐5,6‐dihydro‐6‐arylpyrimidine‐4(3H)‐ones were obtained via an unexpected mechanism. 相似文献
9.
Sequential Ugi Four‐Component Reaction (4‐CR)/CH Activation Using (Diacetoxyiodo)benzene for the Synthesis of 3‐(Diphenylmethylidene)‐2,3‐dihydro‐1H‐indol‐2‐ones 下载免费PDF全文
A sequential Ugi four‐component reaction (4‐CR)/C? H activation using (diacetoxyiodo)benzene is reported. This process is a five‐component reaction of aromatic aldehydes, aniline derivatives, isocyanides, phenylpropiolic acid (3‐phenylprop‐2‐ynoic acid), and (diacetoxyiodo)benzene for the synthesis of 3‐(diphenylmethylidene)‐2,3‐dihydro‐1H‐indol‐2‐ones. This procedure offers several advantages such as good yields, high bond‐forming efficiency, selectivity, and short reaction times. 相似文献
10.
Dialkylzinc‐Mediated Cross‐Coupling Reactions of Perfluoroalkyl and Perfluoroaryl Halides with Aryl Halides 下载免费PDF全文
Hisano Kato Dr. Keiichi Hirano Daisuke Kurauchi Naoyuki Toriumi Prof. Dr. Masanobu Uchiyama 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(10):3895-3900
A highly chemoselective perfluoroalkylation reaction of aromatic halides is reported. Thermally stable perfluoroalkylzinc reagents, generated by a rapid halogen–zinc exchange reaction between diorganozinc and perfluoroalkyl halide species, couple with a wide range of aryl halides in the presence of a copper catalyst, in moderate to high yields. Good stability of the perfluoroalkylzinc species was indicated by DFT calculation and the reagents were storable for at least three months under argon without loss of activity. This method is applicable to gram‐scale synthesis, and its functional group tolerance compares favorably with reported protocols. 相似文献
11.
Facile Synthesis of new 3,5‐Dispiro Substituted Piperidine Analogs via Microwave‐Assisted One Pot Multicomponent Reaction 下载免费PDF全文
Praveen Chidurala Venkateshwarlu Jetti Jyotsna S. Meshram 《Journal of heterocyclic chemistry》2016,53(2):389-392
An eco‐efficient one‐pot three component reaction for the synthesis of 3,5‐dispirosubstituted piperidines is reported by condensing of 2‐thiobarbituric acid, formaldehyde, and aromatic amines in the presence of a catalytic amount of p‐toluenesulfonic acid (1.0 equivalent) in dimethyl sulfoxide. The reactions were examined by two special methods such as classical heating and microwave (MW) irradiation. In general, improvements in rates and yields were observed when reactions were carried out under MW irradiation compared to the conventional method. 相似文献
12.
Zhengbing Pan Hui Xu Kaimin Mao Lei Dai Liming Zhao Liangce Rong 《Journal of heterocyclic chemistry》2019,56(4):1393-1402
In this research, we have developed an efficient three‐component reaction for the synthesis of pyrano[3,2‐c]pyridine derivatives from the reaction of aromatic aldehydes, tert‐butyl 2,4‐dioxopiperidine‐1‐carboxylate, and N‐methyl‐1‐(methylthio)‐2‐nitroethylen‐1‐amine in [BMIM]BF4 medium. The advantages of this method were readily available starting materials, simple reaction conditions, and satisfactory yields. 相似文献
13.
One‐pot Synthesis of 3,4‐Dihydropyrimidin‐2(1H)‐ones Catalysed by Cupric Acetate under Solvent‐free Conditions 下载免费PDF全文
Chingrishon Kathing Jims World Star Rani Nongthombam Geetmani Singh Shokip Tumtin Ridaphun Nongrum Rishanlang Nongkhlaw 《中国化学会会志》2014,61(11):1254-1258
A solvent‐free synthesis of 3,4‐dihydropyrimidin‐2(1H)‐ones from aromatic aldehydes, β‐keto ester/acetyl acetone and urea catalysed by cupric acetate under thermal condition is reported as a simple and an efficient protocol. Compared with classical Biginelli reaction reported in 1893, this new method provides much improved modification in terms of yield and reaction time. The usage of milder catalyst, environmental friendly procedures and excellent yields within a very short time (5–15 min) are the advantages of the method in which the involvement of solvent‐free condition adds an edge to the method. Thus, the efficiency of the protocol enabled the rapid synthesis of 3,4‐dihydropyrimidin‐2(1H)‐one derivatives in a short duration. 相似文献
14.
We have developed highly efficient, one‐pot three component reaction of 5‐amino‐uracil and aromatic aldehydes with thioglycolic acid for the synthesis of N‐uracil‐thiazolidinones in excellent yields. The same products were also prepared by the reaction of Schiff bases of 5‐amino‐uracil with thioglycolic acid. In addition, benzylation of thiazolidinone derivatives and Schiff bases by using benzyl chloride was investigated. The results obtained from elemental microanalysis and different spectral data are in agreement with the assigned structures. 相似文献
15.
Lijiu Gao Honglou Ji Liangce Rong Dan Tang Yunyun Zha Yanhui Shi Shujiang Tu 《Journal of heterocyclic chemistry》2011,48(4):957-960
A simple, efficient and convenient one‐pot synthesis of 2,3‐dihydroquinazolin‐4(1H)‐one derivatives under solvent‐free and catalyst‐free conditions by the reaction of aromatic aldehydes, isatoic anhydride, and ammonium acetate was reported. The advantages of this protocol include short reaction time, mild reaction conditions, easy work‐up, high yields, and environmental friendliness. J. Heterocyclic Chem., (2011). 相似文献
16.
Catalytic C?H borylation has been reported using newly designed iron complexes bearing a 4,5,6,7‐tetrahydroisoindol‐2‐ide‐based PNP pincer ligand. The reaction tolerated various five‐membered heteroarenes, such as pyrrole derivatives, as well as six‐membered aromatic compounds, such as toluene. Successful examples of the iron‐catalyzed sp3 C?H borylation of anisole derivatives were also presented. 相似文献
17.
Jeffrey A. Boerth Joshua R. Hummel Prof. Dr. Jonathan A. Ellman 《Angewandte Chemie (International ed. in English)》2016,55(41):12650-12654
A highly stereoselective three‐component C(sp2)?H bond addition across alkene and polarized π‐bonds is reported for which CoIII catalysis was shown to be much more effective than RhIII. The reaction proceeds at ambient temperature with both aryl and alkyl enones employed as efficient coupling partners. Moreover, the reaction exhibits extremely broad scope with respect to the aldehyde input; electron rich and poor aromatic, alkenyl, and branched and unbranched alkyl aldehydes all couple in good yield and with high diastereoselectivity. Multiple directing groups participate in this transformation, including pyrazole, pyridine, and imine functional groups. Both aromatic and alkenyl C(sp2)?H bonds undergo the three‐component addition cascade, and the alkenyl addition product can readily be converted into diastereomerically pure five‐membered lactones. Additionally, the first asymmetric reactions with CoIII‐catalyzed C?H functionalization are demonstrated with three‐component C?H bond addition cascades employing N‐tert‐butanesulfinyl imines. These examples represent the first transition metal catalyzed C?H bond additions to N‐tert‐butanesulfinyl imines, which are versatile and extensively used intermediates for the asymmetric synthesis of amines. 相似文献
18.
Catalyst‐Free Three‐Component Tandem CDC Cyclization: Convenient Access to Isoindolinones from Aromatic Acid,Amides, and DMSO by a Pummerer‐Type Rearrangement 下载免费PDF全文
Peng‐Min Wang Fan Pu Ke‐Yan Liu Prof. Dr. Chao‐Jun Li Prof. Dr. Zhong‐Wen Liu Dr. Xian‐Ying Shi Juan Fan Dr. Ming‐Yu Yang Prof. Dr. Jun‐Fa Wei 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(18):6262-6267
A catalyst‐free multicomponent CDC reaction is rarely reported, especially for the intermolecular tandem CDC cyclization, which represents an important strategy for constructing cyclic compounds. Herein, a three‐component tandem CDC cyclization by a Pummerer‐type rearrangement to afford biologically relevant isoindolinones from aromatic acids, amides, and DMSO, is described. This intermolecular tandem reaction undergoes a C(sp2)?H/C(sp3)?H cross‐dehydrogenative coupling, C?N bond formation, and intramolecular amidation. A notable feature of this novel protocol is avoiding a catalyst and additive (apart from oxidant). 相似文献
19.
Green Biginelli‐type Reaction: Solvent‐free Synthesis of 5‐unsubstituted 3,4‐dihydropyrimdin‐2(1H)‐ones 下载免费PDF全文
The Biginelli‐type compounds, 5‐unsubstituted 3,4‐dihydropyrimdin‐2(1H)‐ones were synthesized by a one‐pot three‐component condensation of aromatic aldehydes, aromatic ketones and urea in the presence of SnCl4 · 5H2O under solvent‐free conditions. The advantages of this method are short reaction time (4–10 min), excellent yields (74–97%), inexpensive catalyst and solvent‐free conditions. A plausible mechanism was proposed. 相似文献
20.
2,3‐Dihydroquinazolin‐4(1H)‐one derivatives were synthesized via a one‐pot, three component reaction of isatoic anhydride and an aromatic aldehyde with ammonium acetate or primary amine catalyzed by silica‐bonded S‐sulfonic acid in ethanol at 80°C. The reaction work‐up is simple and the catalyst is easily separated from the products by filtration. The heterogeneous catalyst was recycled for ten runs upon the condensation reaction of isatoic anhydride and 4‐chlorobenzaldehyde with ammonium acetate without losing its catalytic activity. 相似文献