A facile tandem route has been developed for constructing quinazolinones from various aminobenzamides and in-situ generated aldehydes.Visible light was found to play a dual role:first oxidizes the alcohol to the aldeh...A facile tandem route has been developed for constructing quinazolinones from various aminobenzamides and in-situ generated aldehydes.Visible light was found to play a dual role:first oxidizes the alcohol to the aldehyde and then facilitates its cyclization with o-substituted aniline.Furthermore,alcohols are perfe ct alternatives to aldehydes because they are greene r,more available,more economical,more stable,and less toxic tha n aldehydes.The first reaction step continuously provides material for the second step,which effectively reduces loss through volatilization,oxidation,and polymerization of the aldehyde,while avoiding its toxicity.A variety of quinazolinones can be prepared in the presence of visible light without any additional photocatalyst.The developed synthesis protocol proceeds with the merits of mild conditions,broad substrate scope,operational simplicity,a nd high atom efficiency,with an eco-energy source under metal-free,photocatalyst-free,and ambient conditions.展开更多
Bis-silicon-bridged stilbene derivatives were synthesized in a modified procedure that combined the preparation of bis[2- （silyl）phenyl]acetylene and its intramolecular reductive cyclization in one pot. The results ...Bis-silicon-bridged stilbene derivatives were synthesized in a modified procedure that combined the preparation of bis[2- （silyl）phenyl]acetylene and its intramolecular reductive cyclization in one pot. The results indicated that the one pot approach produced target products in a comparable yield to that of the two-step method reported previously.展开更多
A one pot protocol for the synthesis of dibenzodiazepinones was developed. The substituted ethyl 2- halobenzoates are cross-coupled with o-phenylenediamine utilizing a ligand-free, Cul catalyzed system, which spontane...A one pot protocol for the synthesis of dibenzodiazepinones was developed. The substituted ethyl 2- halobenzoates are cross-coupled with o-phenylenediamine utilizing a ligand-free, Cul catalyzed system, which spontaneously undergo an intramolecular N-acylation in ethylene glycol to give the corresponding products in high yields. This synthetic protocol provides a concise and efficient access to a wide variety of dibenzodiazepinone, including biologically active molecules.展开更多
In the past century,industrial and economic growth relied heavily on fossil fuels such as coal,oil,and natural gas.As the society energy demands continue to grow,these fossil fuel reserves are depleted,leading to sign...In the past century,industrial and economic growth relied heavily on fossil fuels such as coal,oil,and natural gas.As the society energy demands continue to grow,these fossil fuel reserves are depleted,leading to significant environmental issues[1].Currently,sustainable biomass resources have attracted much attention as potential substitutes to fossil fuels for producing biofuels and commodity chemicals[2].展开更多
African swine fever(ASF),caused by the African swine fever virus(ASFV),has brought enormous economic loss and represents a major threat to the global pig industry(Vergne et al.2017).ASFVs are divided into 24 genotypes...African swine fever(ASF),caused by the African swine fever virus(ASFV),has brought enormous economic loss and represents a major threat to the global pig industry(Vergne et al.2017).ASFVs are divided into 24 genotypes based on their B646L gene,with only genotypes Ⅰ and Ⅱ circulating globally(Dixon et al.2019).展开更多
A combination of sodium borohydride and a catalytic amount of indium（Ⅲ） chloride in acetonitrile reduces imines formed in-situ from aldehydes and amines to the corresponding functionalised secondary and tertiary am...A combination of sodium borohydride and a catalytic amount of indium（Ⅲ） chloride in acetonitrile reduces imines formed in-situ from aldehydes and amines to the corresponding functionalised secondary and tertiary amines in moderate to good yields. Noteworthy is that highly chemoselective reactions were achieved in the presence of other functional groups such as halogens, carbon-carbon double bonds and hydroxyl groups.展开更多
Diammonium hydrogen phosphate and potassium carbonate-catalyzed one-pot synthesis of 1,4- phenylene-bis（2-amino-4H-pyran-3-carbonitrile and 2-amino-4-aryl-4H-pyran-3-carbonitrile deriva- tives has been achieved by a ...Diammonium hydrogen phosphate and potassium carbonate-catalyzed one-pot synthesis of 1,4- phenylene-bis（2-amino-4H-pyran-3-carbonitrile and 2-amino-4-aryl-4H-pyran-3-carbonitrile deriva- tives has been achieved by a three-component cyclocondensation of aldehydes, malononitrile, and different nucleophiles in aqueous medium in high yields.展开更多
Two new different Cu(Ⅱ) MOFs with the same 1,3,5-tris(1-imidazolyl) benzene(tib) ligand {[Cu(tib)2]·(H2O)2·Br2}n(1) and {[Cu2(tib)·Br·Cl]·2Br}n(2) were obtained by one pot synthesized of tib ...Two new different Cu(Ⅱ) MOFs with the same 1,3,5-tris(1-imidazolyl) benzene(tib) ligand {[Cu(tib)2]·(H2O)2·Br2}n(1) and {[Cu2(tib)·Br·Cl]·2Br}n(2) were obtained by one pot synthesized of tib with CuBr in the presences of HCl and water. X-ray single crystal diffraction analyses indicate that both complexes 1 and 2 have two dimensional frameworks containing different building blocks. Each Cu(Ⅱ) atom in complex 1 is coordinated by four N atoms from different tib ligands. However, there are two different cryptographic Cu(Ⅱ) atoms in complex 2, one is four coordinated by two bromine atoms and two N atoms from different tib ligands, the other is six coordinated by two chloride atoms and four N atoms from different tib ligands. The thermal gravimetric analysis of complexes 1 and 2 are depicted in the paper.展开更多
A convenient one-pot three-component method for the preparation of tetra-substituted thiophene derivatives has been developed. Reaction ofacetyl acetone 1, phenyl isothiocynate 2 and 2-chloromethyI derivatives 3a-3c i...A convenient one-pot three-component method for the preparation of tetra-substituted thiophene derivatives has been developed. Reaction ofacetyl acetone 1, phenyl isothiocynate 2 and 2-chloromethyI derivatives 3a-3c in the presence of potassium carbonate afforded the target compounds, namely ethyl 2-（4-acetyl-3-methyl-5-（phenylamino）thiophen-2-yl）-2-oxoacetate derivatives 4a-4e, ethyl 3-（4- acetyl-3-methyl-5-（phenylamino）thiophen-2-yl）-3-oxopropanoate derivatives 4f-4i, di（（4-acetyl-3- methyl-5-phenylamino）thiophen-2-yl）ketone derivatives 4j-4n in reasonable overall yields. The synthesized compounds were screened for antirnicrobial activity. The detailed synthesis, spectroscopic data and antimicrobial activities of synthesized compounds were reported.展开更多
This paper describes the combustion synthesis ofα-Fe2O3 nanopowder at much lower temperature and its catalytic activity for the one-pot preparation of 3,4-dihydropyrano[c]chromenes.The combustion derivedα-Fe_2O_3 na...This paper describes the combustion synthesis ofα-Fe2O3 nanopowder at much lower temperature and its catalytic activity for the one-pot preparation of 3,4-dihydropyrano[c]chromenes.The combustion derivedα-Fe_2O_3 nanopowder was characterized by powder X-ray diffraction（PXRD）,Braunauer,Emmett and Teller（BET） surface area,scanning electron microscopy（SEM） and Fourier transform infrared spectroscopy（FTIR）.Highly efficient,three-component condensation of aromatic aldehyde,malanonitrile and 4- hydroxycoumarin catalyzed byα-Fe2O3 nanoparticles at room temperature is described.The method offers an excellent alternative to the synthesis of 3,4-dihydropyrano[c]chromenes.The reactions are rapid,clean,and the products with good yield and high purity.展开更多
We report a new, effective and simple method for preparing a,fl-unsaturated carbonyl compounds by reacting ketones and aromatic alcohols at 56 ℃ in the presence of CrO3 （CrO3 acts as an oxidant and also a catalyst）...We report a new, effective and simple method for preparing a,fl-unsaturated carbonyl compounds by reacting ketones and aromatic alcohols at 56 ℃ in the presence of CrO3 （CrO3 acts as an oxidant and also a catalyst） for around 10 h. The condensation reactions occurred effectively among a wide combination of ketones and alcohols. The procedure is simple and the yields can be high up to 98%. And a probable mechanism is proposed.展开更多
The title compound was synthesized by a one pot synthesis method with ethanolamine ,ketone and dichloroacetyl chloride. The product was characterization by IR, 1 HNMR,UV, and elementary analysis.
Herein we reported a one-pot synthesis of arylsubstituted imidazolin-2-ones by the cyclization of α-aminoacetophenone hydrochloride analogues 2 with arylisocyanates 3. Compared with other known synthetic route, this ...Herein we reported a one-pot synthesis of arylsubstituted imidazolin-2-ones by the cyclization of α-aminoacetophenone hydrochloride analogues 2 with arylisocyanates 3. Compared with other known synthetic route, this method resulted in higher yield.展开更多
Clustered regularly interspaced short palindromic repeats(CRISPR)is an adaptive immune system in microorganisms,utilizing CRISPR RNA(crRNA)and CRISPR-associated proteins(Cas)to eliminate invasive nucleic acids[1].Due ...Clustered regularly interspaced short palindromic repeats(CRISPR)is an adaptive immune system in microorganisms,utilizing CRISPR RNA(crRNA)and CRISPR-associated proteins(Cas)to eliminate invasive nucleic acids[1].Due to its simplicity,programmability,precise targeting,and efficient cleavage abilities,the CRISPR/Cas system has become a highly effective diagnostic tool[2].As a prominent system in CRISPR-based diagnostics,CRISPR/Cas12a enables Cas12a to cleave the target DNA(ciscleavage)and continuously trans-cleave non-specific singlestranded DNA(ssDNA)following crRNA-mediated binding to the target DNA[3,4].展开更多
Hydrogen storage-a key hurdle for clean energy-has advanced with a pilot plant producing 150 tons of magnesium hydride annually since January 10,2025.Developed by a research team at the Dalian Institute of Chemical Ph...Hydrogen storage-a key hurdle for clean energy-has advanced with a pilot plant producing 150 tons of magnesium hydride annually since January 10,2025.Developed by a research team at the Dalian Institute of Chemical Physics(DICP)of the Chinese Academy of Sciences,the project uses a novel“one-pot”method to synthesize magnesium-based materials that store hydrogen safely and efficiently.展开更多
As a novel class of spirofluorenes,spirobifluorene(SBF)and spiro[fluo-rene-9,9'-xanthene]derivatives(SFXs)have orthogonal geometric config-uration,spiro-conjugation effect,and rigid steric hindrance,which can be w...As a novel class of spirofluorenes,spirobifluorene(SBF)and spiro[fluo-rene-9,9'-xanthene]derivatives(SFXs)have orthogonal geometric config-uration,spiro-conjugation effect,and rigid steric hindrance,which can be widely used in the fields of synthetic chemistry,materials chemistry and supramolecular chemistry.Due to their facile one-pot synthetic route,and to the variety of molecular designs,SFXs are expected to become new spiro functional materials that replace SBF.In this review,we present the history,development and expansion of SFXs synthesis in one-pot methods,and the advantages and limitations of one-pot synthesis are also dis-cussed.展开更多
A novel fused isocoumarin skeleton has been synthesized through selective domino multicyclizations by mixing homothallic acid and 2,3-diphenylacryloyl chloride at 200℃ under catalyst and solvent free reaction conditi...A novel fused isocoumarin skeleton has been synthesized through selective domino multicyclizations by mixing homothallic acid and 2,3-diphenylacryloyl chloride at 200℃ under catalyst and solvent free reaction conditions. Six fused rings with two stereogenic centers were assembled in a convenient onepot operation in good yield. The resulting hexacyclic fused isocoumarin skeleton and its stereochemistry was fully characterized and unambiguously confirmed by X-ray diffraction analysis.展开更多
A practical one-pot protocol for the synthesis of 2,5-disubstituted oxazoles from 1-aryl-2-nitroethanones was reported. In the presence of iron/AcOH in acetonitrile, the reaction of 1-aryl-2-nitroethanones with trimet...A practical one-pot protocol for the synthesis of 2,5-disubstituted oxazoles from 1-aryl-2-nitroethanones was reported. In the presence of iron/AcOH in acetonitrile, the reaction of 1-aryl-2-nitroethanones with trimethyl orthoacetate or trimethyl orthobenzoate delivered the corresponding 2,5-disubstituted oxazoles in moderate to good yields.展开更多
Wittig reactions of benzaldehydes, alkanals, and cycloalkanals as well as of acetophenones are carried out with alkoxycarbonyl methylidenetriphenylphosphoranes in 10 w% aqueous NaOH, where the cinnamates and alkenoate...Wittig reactions of benzaldehydes, alkanals, and cycloalkanals as well as of acetophenones are carried out with alkoxycarbonyl methylidenetriphenylphosphoranes in 10 w% aqueous NaOH, where the cinnamates and alkenoates produced are hydrolysed in situ and the corresponding acids are obtained after mostly simple extractive work-up, often without employing organic solvents. Under the same conditions, benzaldehydes are reacted with alkoxycarbonyl bromomethy-lidenephosphorane to produce 3-arylprop-2-ynoic acids (arylpropiolic acids).展开更多
A convenient synthesis of 6-amino-2H,4H-pyrano[2,3-F]pyrazole-5-carbonitriles has been accomplished by one pot four-component cyclocondensation of aromatic aldehydes（1a-o） malanonitrile（2）, ethyl acetoacetate（3）...A convenient synthesis of 6-amino-2H,4H-pyrano[2,3-F]pyrazole-5-carbonitriles has been accomplished by one pot four-component cyclocondensation of aromatic aldehydes（1a-o） malanonitrile（2）, ethyl acetoacetate（3）, and hydrazine hydrate（4） in freshly prepared deep eutectic solvent, DES（choline chloride：urea）. This protocol has afforded corresponding pyrano[2,3-F]pyrazoles in shorter reaction time with high yields, and it avoids the use of typical toxic catalysts and solvents.展开更多
基金supported by the National Natural Science Foundation of China (No.21462001)a Science and Technology Project of Jiangxi Province (No.20192BBH80012)。
文摘A facile tandem route has been developed for constructing quinazolinones from various aminobenzamides and in-situ generated aldehydes.Visible light was found to play a dual role:first oxidizes the alcohol to the aldehyde and then facilitates its cyclization with o-substituted aniline.Furthermore,alcohols are perfe ct alternatives to aldehydes because they are greene r,more available,more economical,more stable,and less toxic tha n aldehydes.The first reaction step continuously provides material for the second step,which effectively reduces loss through volatilization,oxidation,and polymerization of the aldehyde,while avoiding its toxicity.A variety of quinazolinones can be prepared in the presence of visible light without any additional photocatalyst.The developed synthesis protocol proceeds with the merits of mild conditions,broad substrate scope,operational simplicity,a nd high atom efficiency,with an eco-energy source under metal-free,photocatalyst-free,and ambient conditions.
文摘Bis-silicon-bridged stilbene derivatives were synthesized in a modified procedure that combined the preparation of bis[2- （silyl）phenyl]acetylene and its intramolecular reductive cyclization in one pot. The results indicated that the one pot approach produced target products in a comparable yield to that of the two-step method reported previously.
基金National Natural Science Foundation of China(No.81102322)the Global Alliance for TB Drug Development(TB alliance)for their financial supports
文摘A one pot protocol for the synthesis of dibenzodiazepinones was developed. The substituted ethyl 2- halobenzoates are cross-coupled with o-phenylenediamine utilizing a ligand-free, Cul catalyzed system, which spontaneously undergo an intramolecular N-acylation in ethylene glycol to give the corresponding products in high yields. This synthetic protocol provides a concise and efficient access to a wide variety of dibenzodiazepinone, including biologically active molecules.
基金funded by the Master,PhD Scholarship Programme of Vingroup Innovation Foundation(VINIF),code VINIF.2024.TS.035funded by Vietnam National University,Ho Chi Minh City(VNUHCM)under grant number NCM2024-18-01。
文摘In the past century,industrial and economic growth relied heavily on fossil fuels such as coal,oil,and natural gas.As the society energy demands continue to grow,these fossil fuel reserves are depleted,leading to significant environmental issues[1].Currently,sustainable biomass resources have attracted much attention as potential substitutes to fossil fuels for producing biofuels and commodity chemicals[2].
基金supported by the National Natural Science Fund for Distinguished Young Scholars of China(31925036 and 32025034)the Shandong Provincial Key R&D Program,China(2021LZGC001)+3 种基金the Biological Breeding-Major Projects,Institute of Zoology,Chinese Academy of Sciences and Institute of Animal Science,Chinese Academy of Agricultural Sciences(2023ZD04074 and 2023ZD0404604)the Special Project of Longhu Laboratory,China(LHLab_ZD20230012)the National Natural Science Foundation of China(32230100,32330099 and 32201257)the National Key Research and Development Program of China(2020YFA0509503,2022YFF0710703,2021YFA0805902 and 2022XAGG0121,2022YFF1002803).
文摘African swine fever(ASF),caused by the African swine fever virus(ASFV),has brought enormous economic loss and represents a major threat to the global pig industry(Vergne et al.2017).ASFVs are divided into 24 genotypes based on their B646L gene,with only genotypes Ⅰ and Ⅱ circulating globally(Dixon et al.2019).
文摘A combination of sodium borohydride and a catalytic amount of indium（Ⅲ） chloride in acetonitrile reduces imines formed in-situ from aldehydes and amines to the corresponding functionalised secondary and tertiary amines in moderate to good yields. Noteworthy is that highly chemoselective reactions were achieved in the presence of other functional groups such as halogens, carbon-carbon double bonds and hydroxyl groups.
文摘Diammonium hydrogen phosphate and potassium carbonate-catalyzed one-pot synthesis of 1,4- phenylene-bis（2-amino-4H-pyran-3-carbonitrile and 2-amino-4-aryl-4H-pyran-3-carbonitrile deriva- tives has been achieved by a three-component cyclocondensation of aldehydes, malononitrile, and different nucleophiles in aqueous medium in high yields.
基金funded by the National Natural Science Foundation of China(21261009)Young Scientist Foundation of Jiangxi Provincethe Education Fund of Jiangxi Province(GJJ13434)
文摘Two new different Cu(Ⅱ) MOFs with the same 1,3,5-tris(1-imidazolyl) benzene(tib) ligand {[Cu(tib)2]·(H2O)2·Br2}n(1) and {[Cu2(tib)·Br·Cl]·2Br}n(2) were obtained by one pot synthesized of tib with CuBr in the presences of HCl and water. X-ray single crystal diffraction analyses indicate that both complexes 1 and 2 have two dimensional frameworks containing different building blocks. Each Cu(Ⅱ) atom in complex 1 is coordinated by four N atoms from different tib ligands. However, there are two different cryptographic Cu(Ⅱ) atoms in complex 2, one is four coordinated by two bromine atoms and two N atoms from different tib ligands, the other is six coordinated by two chloride atoms and four N atoms from different tib ligands. The thermal gravimetric analysis of complexes 1 and 2 are depicted in the paper.
文摘A convenient one-pot three-component method for the preparation of tetra-substituted thiophene derivatives has been developed. Reaction ofacetyl acetone 1, phenyl isothiocynate 2 and 2-chloromethyI derivatives 3a-3c in the presence of potassium carbonate afforded the target compounds, namely ethyl 2-（4-acetyl-3-methyl-5-（phenylamino）thiophen-2-yl）-2-oxoacetate derivatives 4a-4e, ethyl 3-（4- acetyl-3-methyl-5-（phenylamino）thiophen-2-yl）-3-oxopropanoate derivatives 4f-4i, di（（4-acetyl-3- methyl-5-phenylamino）thiophen-2-yl）ketone derivatives 4j-4n in reasonable overall yields. The synthesized compounds were screened for antirnicrobial activity. The detailed synthesis, spectroscopic data and antimicrobial activities of synthesized compounds were reported.
基金VTU(VTU/Aca./2009-10/A-9/11714) for the financial support and Chemistry-TEQIP Laboratory of MSRIT and SSMRV College, Chemistry Research Center
文摘This paper describes the combustion synthesis ofα-Fe2O3 nanopowder at much lower temperature and its catalytic activity for the one-pot preparation of 3,4-dihydropyrano[c]chromenes.The combustion derivedα-Fe_2O_3 nanopowder was characterized by powder X-ray diffraction（PXRD）,Braunauer,Emmett and Teller（BET） surface area,scanning electron microscopy（SEM） and Fourier transform infrared spectroscopy（FTIR）.Highly efficient,three-component condensation of aromatic aldehyde,malanonitrile and 4- hydroxycoumarin catalyzed byα-Fe2O3 nanoparticles at room temperature is described.The method offers an excellent alternative to the synthesis of 3,4-dihydropyrano[c]chromenes.The reactions are rapid,clean,and the products with good yield and high purity.
基金Project supported by the National Natural Science Foundation of China （NSFC） （Nos. 50825303 and 30890140） and the Ministry of Science and Technology of China （No. 2009CB-930400）.
文摘We report a new, effective and simple method for preparing a,fl-unsaturated carbonyl compounds by reacting ketones and aromatic alcohols at 56 ℃ in the presence of CrO3 （CrO3 acts as an oxidant and also a catalyst） for around 10 h. The condensation reactions occurred effectively among a wide combination of ketones and alcohols. The procedure is simple and the yields can be high up to 98%. And a probable mechanism is proposed.
文摘The title compound was synthesized by a one pot synthesis method with ethanolamine ,ketone and dichloroacetyl chloride. The product was characterization by IR, 1 HNMR,UV, and elementary analysis.
文摘Herein we reported a one-pot synthesis of arylsubstituted imidazolin-2-ones by the cyclization of α-aminoacetophenone hydrochloride analogues 2 with arylisocyanates 3. Compared with other known synthetic route, this method resulted in higher yield.
基金supported by the Natural Science Foundation of Xiamen,China(3502Z202373019)National Key R&D Program of China(2023YFD1800502)+5 种基金National Natural Science Foundation of China(31971369)Natural Science Foundation of Fujian Province(2019J02004)CAMS Innovation Fund for Medical Sciences(2019RU022)the Fundamental Research Funds for the Central Universities(20720220006)the Fundamental Research Funds for the Central Universities(20720220005)the Science and Technology Planning Project of Guangdong Province of China(B1212030009)。
文摘Clustered regularly interspaced short palindromic repeats(CRISPR)is an adaptive immune system in microorganisms,utilizing CRISPR RNA(crRNA)and CRISPR-associated proteins(Cas)to eliminate invasive nucleic acids[1].Due to its simplicity,programmability,precise targeting,and efficient cleavage abilities,the CRISPR/Cas system has become a highly effective diagnostic tool[2].As a prominent system in CRISPR-based diagnostics,CRISPR/Cas12a enables Cas12a to cleave the target DNA(ciscleavage)and continuously trans-cleave non-specific singlestranded DNA(ssDNA)following crRNA-mediated binding to the target DNA[3,4].
文摘Hydrogen storage-a key hurdle for clean energy-has advanced with a pilot plant producing 150 tons of magnesium hydride annually since January 10,2025.Developed by a research team at the Dalian Institute of Chemical Physics(DICP)of the Chinese Academy of Sciences,the project uses a novel“one-pot”method to synthesize magnesium-based materials that store hydrogen safely and efficiently.
基金the National Natural Science Foundation of China(21774061,2207112 and 61935017)Natural Science Foundation major research program integration project(Grant Number 91833306)+1 种基金Six Peak Talents Foundation of Jiangsu Province(XCLCXTD-009)Open Project from State Key Labor-atory of Supramolecular Structure and Materials at Jilin University(No.sklssm202014).
文摘As a novel class of spirofluorenes,spirobifluorene(SBF)and spiro[fluo-rene-9,9'-xanthene]derivatives(SFXs)have orthogonal geometric config-uration,spiro-conjugation effect,and rigid steric hindrance,which can be widely used in the fields of synthetic chemistry,materials chemistry and supramolecular chemistry.Due to their facile one-pot synthetic route,and to the variety of molecular designs,SFXs are expected to become new spiro functional materials that replace SBF.In this review,we present the history,development and expansion of SFXs synthesis in one-pot methods,and the advantages and limitations of one-pot synthesis are also dis-cussed.
基金supported by the Higher Education Commission (HEC),Govt.of Pakistan for financial support
文摘A novel fused isocoumarin skeleton has been synthesized through selective domino multicyclizations by mixing homothallic acid and 2,3-diphenylacryloyl chloride at 200℃ under catalyst and solvent free reaction conditions. Six fused rings with two stereogenic centers were assembled in a convenient onepot operation in good yield. The resulting hexacyclic fused isocoumarin skeleton and its stereochemistry was fully characterized and unambiguously confirmed by X-ray diffraction analysis.
基金Supporting information for this article is available on the WWW under http：//dx.cloi.org/10, 1002/cjoc.201100683 or from the author. AcknowledgementWe thank the National Natural Science Foundationof China （Nos. 20872087, 21002061, 20902057, 21142012）, the State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Leading Academic Discipline Project of Shanghai Municipal Education Commission （No. J50101）, and the Graduate Innovation Fund of Shanghai University for financial support. We thank Dr. Hongmei Deng （Laboratory for Microstructures, Shanghai University） for NMR measurements. We are indebted to Professor Ran Hong of SIOC for enlightening discussions.
文摘A practical one-pot protocol for the synthesis of 2,5-disubstituted oxazoles from 1-aryl-2-nitroethanones was reported. In the presence of iron/AcOH in acetonitrile, the reaction of 1-aryl-2-nitroethanones with trimethyl orthoacetate or trimethyl orthobenzoate delivered the corresponding 2,5-disubstituted oxazoles in moderate to good yields.
文摘Wittig reactions of benzaldehydes, alkanals, and cycloalkanals as well as of acetophenones are carried out with alkoxycarbonyl methylidenetriphenylphosphoranes in 10 w% aqueous NaOH, where the cinnamates and alkenoates produced are hydrolysed in situ and the corresponding acids are obtained after mostly simple extractive work-up, often without employing organic solvents. Under the same conditions, benzaldehydes are reacted with alkoxycarbonyl bromomethy-lidenephosphorane to produce 3-arylprop-2-ynoic acids (arylpropiolic acids).
文摘A convenient synthesis of 6-amino-2H,4H-pyrano[2,3-F]pyrazole-5-carbonitriles has been accomplished by one pot four-component cyclocondensation of aromatic aldehydes（1a-o） malanonitrile（2）, ethyl acetoacetate（3）, and hydrazine hydrate（4） in freshly prepared deep eutectic solvent, DES（choline chloride：urea）. This protocol has afforded corresponding pyrano[2,3-F]pyrazoles in shorter reaction time with high yields, and it avoids the use of typical toxic catalysts and solvents.
