Synthesis of 2-aryl-5-alkyl-7-methoxylbenzo[b]furan derivatives

A series of 2-aryl-5-alkyl-7-methoxylbenzo[b]furan derivatives have been synthesized by utilizing the coupling of methyl 3-methoxy-4-hydroxy-5-bromocinnamate with cuprous phenylacetylide as the key step.The structures of the new compounds were confirmed by1H NMR,IR and MS.The structure of compound 14 was further confirmed by single crystal X-ray.Compound 17 showed cytotoxic activity against human lung carcinoma A549.     

Synthesis of 2-Alkylsulfanyl-6-amino-4-aryl-5-cyanonicotinonitriles by Recyclization of 2,6-Diamino-4-aryl-3,5-dicyano-4Н-thiopyrans with Alkyl Halides

Russian Journal of Organic Chemistry - 2,6-Diamino-4-aryl-3,5-dicyano-4Н-thiopyrans in DMF in the presence of bases recycle into pyridine derivatives. After adding of haloalkanes diverse...     

Synthesis and structure of β-aryl-α-nitroacrylates

The method for preparation of ethyl α-nitrocinnamates by nitroacetic acid ester alkenylation with aromatic aldehydes in the presence of acetic acid and β-alanine has been modified. Structures of the prepared compounds have been proved by electronic, IR, ¹H, and ¹³C-{¹H} NMR spectroscopy (including heteronuclear correlation experiments ¹H-¹³C HMQC and ¹H-¹³C HMBC). In solution these compounds exist in the form of Z-isomer; the Z?E isomerization is observed in the case of the compound containing strong electron-donor group [N(CH₃)₂] at benzene ring.     

Regiocontrolled preparation of 3-acyl-6-aryl-2-pyridones via condensation of 3-aryl-3-chloropropeniminium salts with β-keto-amides

Α series of substituted 3-acyl-6-aryl-2-pyridones have been prepared in one-step reactions via condensation of 3-aryl-3-chloropropeniminium salts with β-keto-amides. This efficient synthesis has the advantages of high yields and simple reaction procedures.     

Synthesis of 9-aryl-3,4,6,7,9,10-hexahydroacridine-1,8(2Н,5Н)-diones

The reaction in a mixture of 1,3-cyclohexanedione (dimedone), arylaldehyde, and ammonium acetate at 160°C during 10–15 min in the absence of solvent leads to the formation of 9-aryl-3,4,6,7,9,10-hexahydroacridine-1,8(2H,5H)-diones. The structure of the products has been confirmed by IR and ¹H NMR spectroscopy data. Antimicrobial activity of the obtained compounds has been studied.

     

Stereoselective synthesis of α-aryl-2-benzofuranmethanamines and α-aryl-1H-indole-2-methanamines through palladium-mediated annulation of chiral α-arylpropargylamines

The title compounds, valuable chiral synthons for the synthesis of biologically active compounds, have been prepared in good yield and with high stereoselectivity through palladium-catalyzed heteroannulation of 2-iodophenol or 2-iodo-N-mesylaniline with enantiomerically pure or enriched α-arylpropargylamines.     

Synthesis of 4-aryl-5,5-dimethyl-5H-1,2,3-triazoles and 4-aryl-3-cyano-5,5-dimethyl Δ-pyrazolines by cycloaddition of 2-diazopropane with iminoethers and propenenitriles

A regiospecific 1,3-dipolar cycloaddition of 2-diazopropane 3 to iminoethers 1a-c, carried out at 0 °C, afforded in two steps the corresponding 4-aryl-5,5-dimethyl-5H-1,2,3-triazoles 5a-c. Under the same conditions, 3-arylpropenenitriles 2a-d led to 3-cyano-5,5-dimethyl Δ¹-pyrazolines 6a-d. Products 4-6 were obtained in good yields (69-85%).     

Photolysis of 3-(1-acyl-5-aryl-3-pyrazolinyl)coumarins—Effective Fluorescence Decay

Photophysical characteristics of new 3-(1-acyl-5-aryl-3-pyrazolinyl)coumarins have been measured. These coumarin derivatives are found to be effective fluorophores and show high values of quantum yields of fluorescence both in nonpolar and in polar solvents. The 3-(1-acyl-5-aryl-3-pyrazolinyl)coumarins turned to be photosensitive compounds and undergo photolysis under irradiation in the range of 310–465 nm. Photolysis is suggested to include retro-cyclization and retro-condensation steps. The process is accompanied by a sharp drop of fluorescence that can be of interest for the creation of new media in optical recording of information.     

Synthesis of 5-alkyl-5-aryl-γ-lactams from 1-aryl-substituted nitroalkanes and methyl acrylate via Michael addition and reductive lactamization

A general method for accessing 5-alkyl-5-aryl-γ-lactams has been developed using readily available aryl bromides, nitroalkanes, and methyl acrylate as the starting materials. The palladium-catalyzed arylation of nitroalkanes gave the 1-aryl-substituted nitroalkanes, which underwent the DBU-mediated Michael addition with methyl acrylate at room temperature to afford the methyl 4-aryl-4-nitroalkanoates. The latter were then subjected to the nitro reduction using NaBH₄–NiCl₂·6H₂O in MeOH at 0 °C to furnish, after treatment with aqueous K₂CO₃ at room temperature, the 5-alkyl-5-aryl-γ-lactams in good to excellent overall yields. Selected examples of N-alkylation of the γ-lactams were also illustrated.     

A New Solution-phase Parallel Synthesis of 2-Alkylamino-3-aryl-5-phenylmethylene-3,5-dihydro-4H-imidazol-4-ones

IntroductionImidazolonesareimportantheterocyclesbearingfungici dal,anti inflammotoryandangiotensinIIantagonisticalactiv ities.1 4 Someof 2 alkylaminoimidazolonesexhibitgoodan tibacterialactivities,5whereasothersshowpotentialantiviralandantitumoractivities.6 Untilnow ,manyofthenewderiva tivesofimidazoloneshavebeensynthesizedtoevaluatetheirbiologicalandpharmaceuticalactivities .Recently ,combinatorialsynthesisoflibrariescontainingsmallorganicmoleculeshasbecomearapidevolvingareaofresearch .7,8…     

Solvent-free synthesis of some new 2-（3,5-dimethoxy-4-methylphenyl）-5-aryl-1,3,4-oxadiazoles

An expeditious microwave-accelerated one-step synthesis of some new 2-（3,5-dimethoxy-4-methylphenyl）-5-aryl-1,3,4- oxadiazoles by reaction of 3,5-dimethoxy-4-methyl hydrazide with different carboxylic acids in presence of thionyl chloride under neat conditions,has been achieved.     

Preparation and Spectral Characterization of 3-Benzyl-6-aryl-1,2,4-triazolothiadiazoles

Introduction1 ,2 ,4- Triazolo[3,4- b][1 ,3,4]thiadiazoles arecondensed heterocyclic compounds having wide-ranging application.They combine the propertiesof triazoles[1] and thiadiazoles[2 ] ,as a result,someof them show antimicrobial,antiinflammatory,fungicidal,antiviral,inhibiting plant pathogenicbacteria,herbicidal,plant- growth regulating,andother activities[3— 5] .Attaching an active methyleneto the fused heterocycle maybe change itsbioactivity.Moreover,hydrogens in the methylenebetween t…     

Organocatalyzed asymmetric Michael reaction of β-aryl-α-ketophosphonates and nitroalkenes

The first enantioselective Michael reaction of β-aryl-α-ketophosphonates and nitroalkenes has been realized by using a new bifunctional Takemoto-type thiourea catalyst. The primary Michael adducts obtained were converted in situ to the corresponding amides through the aminolysis. High yields, excellent diastereoselectivities (>95:5 dr), and good enantioselectivities (up to 81% ee) have been achieved for the corresponding α,β-disubstituted γ-nitroamides. This reaction again demonstrated that α-ketophosphonates are interesting pronucleophiles that can be used as amide surrogates in organocatalyzed reactions.     

A convenient one-pot preparation of methylα-aryl-β-primarylamino alkanoates

Six examples of -aryl- primarylamino esters (V) were synthesized by a convenient one pot methodology, i.e., reaction of lithiated methyl -aryl-acetates with 1-(triphenylphosphoroylideneaminomethyl)benzotriazole (BETMIP) followed by hydrolysis.Center for Heterocyclic Compounds, Department of Chemistry, University of Flo rida, Gainesville, Florida 32611–7200, USA. Published in Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1023–1025, August, 1995. Original article submitted July 3, 1995.Submitted in honor of the 60th anniversary of Professor Nikolai S. Zefirov, an outstanding Russian chemist and a good friend. by Alan R. Katritzky.     

Synthesis and Antibacterial Activities of 4-Amino-3-(1-aryl-5-methyl-1,2,3-triazol-4-yl)-5-mercapto-1,2,4-triazoles/2-Amino-5-(1-aryl-5-methyl-1,2,3-triazol-4-yl)-1,3,4-thiadiazoles and Their Derivatives

ＩｎｔｒｏｄｕｃｔｉｏｎＳｃｈｉｆｆｂａｓｅｓ ,ａｍｉｄｅｓ ,ｉｍｉｄａｚｏｌｏ[2 ,1 ｂ] 1,3,4 ｔｈｉａｄｉａｚｏｌｅｓ,ａｎｄ 7Ｈ ｓ ｔｒｉａｚｏｌｏ[3,4 ｂ] 1,3,4 ｔｈｉａｄｉ ａｚｉｎｅｓｃｏｎｔａｉｎｉｎｇｈｅｔｅｒｏｃｙｃｌｅｓｈａｖｅｂｅｅｎａｔｔｒａｃｔｉｎｇｍｕｃｈａｔｔｅｎｔｉｏｎａｓｐｏｔｅｎｔｉａｌａｎｔｉｆｕｎｇａｌａｇｅｎｔｓ .1 51,2 ,3 ｔｒｉａ ｚｏｌｅ ,6 7ｍｅｒｃａｐｔｏ 1,2 ,4 ｔｒｉａｚｏｌｅ ,81,3,4 ｔｈｉａｄｉａｚｏｌｅ9 10ａｎｄｔｈｅｉｒｒｅｌａｔｅｄｃｏ…     

Synthesis of 1-aryl-3-（3,4-dihydro-2H-chromen-5-yl） ureas as TNF-α inhibitors

A new series of compounds,1-aryl-3-(3,4-dihydro-2H-chromen-5-yl) ureas,have been synthesized and their structures were confirmed by FAB-MS and ~1H NMR.The preliminary pharmacological screening showed that these compounds inhibited TNF-αproduction in lipopolysaccharide (LPS)-stimulated THP-1 cells.     

Synthesis of 1-Benzoyl-3-aryl-4-hydroxy-4-phenylimidazolidin-2-thiones

l-Benzoyl-3-aryl-4-hydroxy-4-phenylimidazolidin-2-thiones can be synthesized readily from the cyclization of 1-benzoyl-3-arylthioureas with bromine-acetophenone in the presence of excess triethylamiqe.     

Organocatalytic asymmetric synthesis of trifluoromethyl-substituted diarylpyrrolines: enantioselective conjugate cyanation of β-aryl-β-trifluoromethyl-disubstituted enones

Ether way: the cinchona-alkaloid-catalyzed title reaction was achieved in high yields with high to excellent ee values for the first time, and affords key intermediates for the biologically important 2 having a trifluoromethylated all-carbon quaternary chiral center. Ether-type catalysts (1) are more efficient in this transformation than the conventional hydroxy analogues.     

Synthesis and Biological Activities of 4-Arylmethylidene-1-aryl-2-（selenomorpholin-4-yl） -2-imidazolin-5-one

In a search for novel agrochemical with high activity and low toxicity, a series of substituted 4,5-dihydro-imidazol-5-one containing selenomorpholine group were synthesized by a three-step synthetic route starting from 2-azido-3-aryl-acrylic acid ethyl ester. The structures of title compounds were confirmed by ^1H NMR, IR, mass spectroscopy and elemental analysis. The preliminary bioassay against GibbereUa zeae, Fusarium oxysporum, Pellicularia sasakii, Physalospora piricola and Cercospora beticola indicated that most title compounds displayed fungicidal activity at the concentration of 50 ppm and compounds 41,4n, 40 were found to have particularly high activities against Physalospora piricola. A further in vivo test showed that compounds 41, 4n and 4o possessed better fungicidal activity against Physalospora piricola at a concentration of 100 ppm than Carbendazim. To our knowledge, this is first report that 4,5-dihy-dro-imidazol-5-one containing selenomorpholine group display fungicidal activity against Physalospora piricola.