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…     

Synthesis of tetrahydro-4H-thiopyran-4-ones (microreview)

Chemistry of Heterocyclic Compounds - In this microreview, we consider the methods used for the synthesis of tetrahydro-4H-thiopyran-4-ones over the last 7 years.     

Synthesis and Fungicidal Activities of 2-Alkylthio-5-phenylmethylene-4H-imidazol-4-ones

2-Alkylthio-5-phenylmethylidene-4H-imidazol-4-ones 4 were synthesized by S-alkylation of 2-thioxo-3-aryl-4-imidazolidinones 3 , which were obtained via cyclization of isothiocyanate 2 with aromatic primary amines. 3 and 4 exhibited good fungicidal activity against Physalospora piricola .     

3, 5-二氢-4H-咪唑啉-4-酮的合成

通过膦亚胺(2)与芳基异氰酸酯的aza-Wittig反应得碳二亚胺(3),再应用3与亲核试剂的成环反应制得了8个2-氨基取代咪唑啉酮的新衍生物5a～5h。探讨了碳二亚胺3与不同亲核试剂反应的活性。     

Synthesis of 4-acyl(alkoxycarbonyl)-5-fluoroalkyl-3,5-dihydroxyfuran-2(5H)-ones

4-Acyl(alkoxycarbonyl)-5-fluoroalkyl-3,5-dihydroxyfuran-2(5H)-ones were obtained for the first time by the reactions of fluoroalkyl-containing 1,3-diketones and 3-oxo esters with oxalyl chloride.     

The Synthesis of 2-Alkylthio-3-alkyl-5-arylmethylidene4H-imidazol-4-ones

2-alkylthio-3-alkyl-5-arylmethylidene-4H-imidazol-4-ones were synthesized by the S-alkylation and N-alkylation of 2-thioxo-5-arylmethylidene-4-imidazolidinones, which were obtained via a tandem aza-Wittig reaction of vinyliminophosphoranes, carbon disulfide, and excess ammonium hydroxide (28% NH₃ in water).     

Synthesis of 4-hydroxy-4,5-dihydro-1,2,4-triazol-5-ones

Summary A series of hydroxamic acid ethoxycarbonylhydrazides was obtained by reactions of ester ethoxycarbonylhydrazones with hydroxylamine. The corresponding 3-substituted 4-hydroxy-4,5-dihydro-1,2,4-triazol-5-ones were synthesized by cyclization of these hydroxamic acid derivatives in basic medium.

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Synthesen von 4-Hydroxy-4,5-dihydro-1,2,4-triazol-5-onen

Zusammenfassung Durch Reaktion von Esterethoxycarbonylhydrazonen und Hydroxylamin wurde eine Reihe von Hydroxamsäureethoxycarbonylhydraziden gewonnen; Cyclisierung dieser Verbindungen durch Base gab die entsprechenden 3-substituierten 4-Hydroxy-4,5-dihydro-1,2,4-triazol-5-one.

     

Synthetic methods for spirofuran-2(5H)-ones (microreview)

Chemistry of Heterocyclic Compounds - This microreview focuses on the preparation of spirofuran-2(5H)-ones, including ipso substitution strategy, PPh3-catalyzed reactions, ring opening reactions,...     

Parallel solution-phase synthesis of 2-alkylthio-5-arylidene-3,5-dihydro-4H-imidazol-4-one by one-pot three-component domino reaction

A practical protocol for the preparation of a parallel solution-phase library of 5-arylidene imidazolone is reported. Target compounds were obtained in good yield, stereoselectively, and purity by one-pot domino reaction from various thiohydantoines, arylaldimines, and halogenoalkanes. Purification of the final products by recrystallization with a mixture of pentane/ethanol allowed simple isolation of the 17 components of the array.     

Synthesis of 5,6-dihydro-4H-thiopyran-4-ones

The anions of 1,4-diaryl-3-buten-2-ones 1 reacts with arylisothiocyanates, yielding intermediates 4 which can ring close to 5,6-dihydro-4H-thiopyran-4-ones 5 . Under similar reaction conditions ethyl 3-oxo-4-pentenoates 7 gives the 6-spiropyrans 9 . Methylation of 3 gives the S-methylated open form 6 .     

Reactivity of 2-thiohydantoins towards various electrophilic reagents: applications to the synthesis of new 2-ylidene-3,5-dihydro-4H-imidazol-4-ones

A new route to 5-(imidazolidin-2-ylidene)-2-methylsulfanyl-3,5-dihydro-imidazol-4-ones 4a-c using ketene dithioacetal intermediates 3a-c is described. The reactivity of thiohydantoin derivatives 2a-c towards N,N-dimethylformamide diethylacetal (DMF-DEA) was also explored using solvent-free technique under microwave irradiation (mu omega). The (1)H- and (13)C-NMR spectra of some representative products are discussed.     

2-氨基-4H-咪唑啉-4-酮衍生物的快速平行合成法

咪唑啉酮衍生物是一类具有良好生物活性和药理活性的杂环化合物 [1,2 ] ,尤其是一些 2 -氨基咪唑啉酮表现出良好的杀菌、抗炎及抗癌活性 [3 ,4 ] .从自然界如一些海洋生物中可分离得到含 2 -氨基咪唑啉酮结构的生物碱 [5,6] .最近 ,组合化学方法广泛地应用于有机合成 ,它包括固相合成法和液相合成法[7～ 9] .我们曾应用氮杂 Wittig反应制得 2 -氨基取代咪唑啉酮衍生物 ,部分化合物表现出一定的抑菌活性 [10 ,11] .本文进一步报道应用液相平行反应法快速合成 2 -氨基 - 4H-咪唑啉 - 4-酮衍生物 (4) .该方法应用烯基膦亚胺 1与苯基异氰酸酯的…     

2-烷硫基-4-芳基亚甲基-5-氢-1-苯氨基-1H-咪唑啉-5-酮的合成与杀菌活性

应用CS2与烯基膦亚胺1的氮杂Wittig反应,得到的异硫氰酸酯2再与苯肼作用得到氨基硫脲3,而后用3与卤代烷在K2CO3的作用下反应直接得到2-烷硫基-4-芳基亚甲基-5-氢-1-苯氨基-1H-咪唑啉-5-酮衍生物4.探讨了反应的条件以及合成的新型杂环化合物的生物活性,结果表明部分化合物表现出较好的杀菌活性.如4e在50 mg/L浓度时,对黄瓜灰霉菌的抑制率为87%.     

2-[(3,5-Diamino-1H-pyrazol-4-yl)methylidene]-1,2-dihydro-3H-indol-3-ones: Synthesis and properties

Russian Chemical Bulletin - Reactions of 3-acetoxy-2-(2,2-dicyanovinyl)indole with hydrazine hydrate and methyl-and phenylhydrazines afforded new indolin-3-one derivatives, namely,...     

2-(4-甲硫苯氧基)-3-(4-甲苯基)-4H-咪唑啉-4-酮衍生物的合成及杀菌活性(Ⅱ)

用烯基膦亚胺与4-甲苯基异氰酸酯、对甲硫苯酚的串联aza-Wittig反应合成了2-(4-甲硫基苯氧基)-3-(4-甲苯基)-4H-咪唑啉-4-酮衍生物.探讨了反应进行的条件和产物的波谱性质,提出了可能的环化反应机理.生成的环化产物均为新的化合物,其结构经元素分析、IR、1H NMR和MS确证.并探讨了所合成的新型杂环化合物的生物活性,结果表明部分化合物表现出良好的抑菌活性,其中3f的活性最好,在质量分数为5×10-5浓度时,对稻瘟菌和苹果轮纹菌的抑制率均达到100%.     

4-芳亚甲基-4,5-二氢-1,3-二苯基吡唑-5-酮的一锅法合成

报道了以乙酸为催化剂,由苯甲酰乙酸乙酯、苯肼和芳香醛经三组分一锅法缩合制备4-芳亚甲基-4,5-二氢-1,3-二苯基吡唑-5-酮衍生物的新方法.该方法缩短了反应时间,得到了中等产率.产物结构经MS,1HNMR,IR和元素分析确证.     

Synthesis of 1,4-dihydro-4-methyl-1-phenyl-5H-1,3,4-benzotriazepin-5-ones

The synthesis of 1,4-dihydro-4-methyl-1-phenyl-5H-1,3,4-benzotriazepin-5-one ( 4a ) and its 8-chloro analog ( 4b ) is described. Attempted synthesis of the 2-methyl analog of 4a from 2-(phenylamino)benzoic acid 1-methylhydrazide ( 10 ) and triethyl orthoaeetate led only to the Schiff base intermediate, 2-(phenylamino)benzoic acid 2-(1-ethoxyethylidene)-1-methylhydrazide ( 11 ). Cyclization of 11 was attempted unsuccessfully with a variety of reagents. The intere?ting reaction products from the treatment of 11 with trifluoroacetic acid are described.