共查询到20条相似文献,搜索用时 15 毫秒
1.
Letzel MC Decker B Rozhenko AB Schoeller WW Mattay J 《Journal of the American Chemical Society》2004,126(31):9669-9674
Recently a new type of calix[4]arenes has been synthesized via condensation of 2,6-dihydroxypyridine and a number of aldehydes. This type of pyridine[4]arenes forms capsules consisting of two single pyridine[4]arenes. These capsules can incorporate different guest molecules, like carboxylic acids and amides in this case. We proved that the guest acids really are incorporated inside the cavity of the capsules by electrospray mass spectrometry, NMR spectroscopy, and theoretical calculations. 相似文献
2.
An efficient and facile synthesis of 2,6-dicyanoanilines via a one-pot reaction of aromatic aldehydes, malononitrile, and cyclic ketones in the presence of NaOH under solvent-free conditions using a grinding method has been developed. Compared with the classical reaction conditions, the new synthetic method has the advantages of excellent yields, shorter reaction times, and mild reaction conditions. 相似文献
3.
Efficient condensation of resorcinol and various aromatic aldehydes in the presence of RuCl3nH2O as a homogeneous catalyst under reflux conditions was investigated.It was found that a very simple method afforded good to excellent yields of the desired products. 相似文献
4.
《Comptes Rendus Chimie》2014,17(9):890-893
Iodine catalyzes the cyclocondensation of various aldehydes with resorcinol to give tetrameric cyclic products, resorcinarenes. Through the reaction of resorcinol with aromatic aldehydes, the product is obtained as a mixture of two isomers, the all-cis isomer (rccc) and the cis-trans-trans isomer (rctt), whereas a single diastereomer, the all-cis, is formed with aliphatic aldehydes. Besides excellent isolated yields, the use of iodine makes this procedure simple, convenient, cost-effective and practical. 相似文献
5.
An Efficient Synthesis of Pyrido[2,3‐d][6,5‐d]dipyrimidine and 5,5′‐Arylmethylenebis(2,6‐diaminopyrimidinone) Derivatives under Microwave Irradiation 下载免费PDF全文
Zhilan Lin Huiling Hu Xinkui You Xueli Zhang Yuan Gao 《Journal of heterocyclic chemistry》2014,51(1):277-281
A series of pyrido[2,3‐d][6,5‐d]dipyrimidine and 5,5′‐arylmethylenebis(2,6‐diaminopyrimidinone) derivatives have been synthesized through a rapid reaction of aromatic aldehydes with aminopyrimidines in acetic acid under microwave irradiation. This method has the advantages of simple operation, high yields, short reaction time, and easy work‐up. 相似文献
6.
A novel one-pot pseudo five-component reaction of isocyanides with 2,5-dihydroxycyclohexa-2,5-diene-1,4-dione and various aliphatic and aromatic aldehydes in ethanol at room temperature has been studied. 2,6-Bis(alkylamino)-benzofuro[5,6-b]furan-4,8-dione derivatives were isolated as the products in good yields after 24 h. 相似文献
7.
Gioacchino Mazzone Giovanni Puglisi Francesco Bonina Antonino Corsaro 《Journal of heterocyclic chemistry》1983,20(5):1399-1401
Treatment of aromatic aldehydes with sulfur and hydrazine hydrate in the ratio 1:2:3, respectively, under the Willgerodt conditions affords the title compounds in excellent yields and in a good state of purity. Under the same conditions 2-chloro and 2,6-dichlorobenzaldehyde yield 3H-1,2-benzodithiole-3-thione and bis-(2,6-dichlorobenzyl)tetrasulfide, respectively. 相似文献
8.
《Green Chemistry Letters and Reviews》2013,6(2):187-193
Abstract Various 2,6-dibenzylidene cycloalkanones were readily prepared in a few minutes with good yields by simply mixing aromatic aldehydes with cycloalkanones in the presence of catalytic amounts of p-toluenesulfonic acid as a solid heterogeneous catalyst under solvent-free condition. 相似文献
9.
Rathinam Ramesh Subramani Maheswari Mani Arivazhagan Jan Grzegorz Malecki Appaswami Lalitha 《Tetrahedron letters》2017,58(40):3905-3909
An environmentally benign, facile and elegant synthetic approach for the convenient access of a series of diverse 2,6-diaryl-tetrahydropyridine-3-carboxylates via a one-pot, pseudo five-component condensation of ethyl acetoacetate, anilines and aromatic aldehydes under mild reaction conditions has been described. This domino strategy allows rapid cyclization in the presence of 10 mol% of cyanuric chloride as a source of hydrochloric acid to afford the desired target skeletons in excellent yields. The present protocol offers prominent advantages of simple operational procedure, metal-free organocatalyst, practically robust and extensive substrate scope. 相似文献
10.
11.
Yttrium(III) Nitrate: A Powerful Catalyst for Green and Rapid Synthesis of Some Supramolecules 下载免费PDF全文
A convenient and rapid procedure for the synthesis of calix[4]resorcinarenes as useful supramolecules has been developed via a reaction of aryl aldehydes with resorcinol in the presence of yttrium(III) nitrate under solvent‐free conditions. This eco‐friendly method has many appealing attributes such as excellent yields, short reactions times, and simple work‐up procedures. 相似文献
12.
12-Aryl-8,9,10,12-tetrahydrobenzo[a]xanthene-11-one derivatives were synthesized by a convenient and environmentally benign procedure involving multicomponent condensation reactions of substituted aromatic aldehydes with 2,7-dihydroxynaphthalene/2-naphthols/2,6-dihydroxynaphthlene and cyclic 1,3-dicarbonyl compounds in task specific acidic ionic liquid[NMP]H_2PO_4 at 80 ℃.This protocol has proved to be efficient in terms of good yields,operational simplicity,easy workup,recyclability of reaction medium/catalyst,and short reaction time. 相似文献
13.
A series of 4-aryl-3,5-dicyano-2,6-di(3′-indolyl)pyridine derivatives were synthesized via a one-pot multicomponent reaction of aromatic aldehydes, 3-cyanoacetyl indoles, and ammonium acetate under microwave irradiation. Particularly valuable features of this method include high yields of products, broad substrate scope, short reaction time, and straightforward procedure. 相似文献
14.
Arash Mouradzadegun Mohammad Reza Ganjali Neda Kheirandish Fatemeh Abadast 《Supramolecular chemistry》2019,31(6):377-381
In this work, for the first time, metal hydrogen phosphates and sulfates have been studied as effective solid acid catalysts for the condensation of resorcinol with aromatic and aliphatic aldehydes to give tetrameric cyclic products, resorcinarenes, which have major roles in biological and industrial activities. This catalyst has several advantages, it is non-toxic, thermally and mechanically stable, inexpensive and highly resistant against organic solvents. It increases the reaction rate about six fold and makes this method an attractive alternative to the existing methods for resorcinarene formation. Interestingly, the present catalyst exhibited a high turnover number (TON) and turnover frequency (TOF) which were even comparable with that of HCl. 相似文献
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16.
A simple and effective pinacol coupling of various aromatic aldehydes mediated by gallium in good yields has been carried out. The reaction is highly effective in water in the prurience of KOH or HCl and was strongly affected by the steric environ-ment surrounding the carbonyl group. Aliphaflc aldehydes, ke-tones and aromatic ketones appear inert under the same reac-tion conditions. 相似文献
17.
Rhodium‐catalyzed ortho‐C‐H olefination of aromatic aldehydes employing transient directing strategy 下载免费PDF全文
A Rhodium(III)‐catalyzed ortho‐C‐H olefination of aromatic aldehydes in the presence of catalytic amount of TsNH2 has been developed. The in situ generated imine intermediate from aldehyde and TsNH2 worked as a transient directing group. Both electron‐rich and electron‐deficient aromatic aldehydes were tolerated, affording the corresponding products in moderate to good yields. Importantly, the present protocol provides a straightforward access to olefinated aromatic aldehydes with aldehydes as the simple starting materials. 相似文献
18.
Hui Wu Xiu-mei Chen Ling Ye Hua-hong Xu Li-ling Pang Da-qing Shi 《Tetrahedron letters》2009,50(9):1062-1065
A Tröger’s base derivative (5,12-dimethyl-3,10-diphenyl-1,3,4,8,10,11-hexaazatetracyclo [6.6.1.02,6.09,13]pentadeca-2(6),4,9(13),11-tetraenes) was used as an efficient catalyst for the three-component Mannich reactions of aromatic aldehydes and aromatic amines with ketones in water at room temperature. This rapid reaction afforded the corresponding β-amino ketones in good yields with excellent stereoselectivity. 相似文献
19.
A chiral indium complex has been discovered to effect high enantioselectivities in the addition of allyltributyl stannanes to aldehydes. The allylation of a variety of aromatic, alpha,beta-unsaturated and aliphatic aldehydes resulted in good yields and high enantioselectivities (90-96% ee). 相似文献