检索结果-南通市图书馆

Studies on K2CO3-Catalyzed 1,4-Addition of 1,2-Allenic Ketones with Diethyl Malonate: Controlled selective synthesis of β, γ-Unsaturated Enones and α-Pyrones

在线全文

学校读者我要写书评

暂无评论

有机化学 2003年第Z1期23卷 214-214页

作者： MA Sheng-Ming YU Shi-Chao State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032

　　The reaction of diethyl malonate with various substituted 1,2-allenic ketone can be catalyzed by 10% of K2CO3leading to polyfunctionalized β, γ-unsaturated enones 3 or 4. With 3-unsaturated 1-substituted-1, 2-allenic ketones, the highly selective formation of β, γ-unsaturated enones 4 was observed; with 1,2-allenic ketones with one or two γ-substituents, only β, γ-unsaturated enones 3 with an unmigrated carbon-carbon double bond were produced; with γ-monosubstituted-1,2-allenic ketones the corresponding (E)-3 were formed highly selectively; with propadienyl ketones, a mixture of β, γ-unsaturated enones 3 and 4 were formed.……

关键词： Diethyl Malonate selective synthesis diethyl malonate double bond

POLYMER-SUPPORTED β-CYCLODEXTRIN CATALYST FOR selective synthesisOF 4-H YDROXYBENZOIC ACID

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 1996年第4期11卷 20-23页

作者：张胜民陆宇萍崔崇 Inst.of Mater.Sci.and Tech..Wuhan Univ.of Tech..Wuhan 430070.China Huazhong University of Science and Technology.Wuhan 430074.China

4-hydroxybenzoic acid was synthesized by one pot method using polymer-bonded β-aminopropionic acid-2-β-cyclodextrin as a *** which the selectivity for 4-hydroxybenzoic acid is 87%. A possible carboxylation mechanism... 详细信息

关键词： functional material polymer-supportedcatalyst β-cyclodextrin selective synthesis 4-hydroxybenzoic acid

An environmentally benign multi-component reaction:Highly regioselective synthesis of functionalized 2-(diarylphosphoryl)-1,2-dihydro-pyridine derivatives

在线全文

学校读者我要写书评

暂无评论

Green synthesis and Catalysis 2022年第1期3卷 59-68页

作者： Kun Li Ying Lv Zihan Lu Xinghan Yun Shengjiao Yan Key Laboratory of Medicinal Chemistry for Natural Resource(Yunnan University) Ministry of EducationSchool of Chemical Science and TechnologyYunnan UniversityKunming 650091China

A novel protocol was developed for the construction of highly functionalized 2-(diarylphosphoryl)-1,2-dihydropyridine derivatives(DAPDHPs)from 3-formylchromones(1),heterocyclic ketene aminals(HKAs,2),and phosphine oxides(R_(2)P(O)H,3)via a novel,one-pot cascade *** of the reaction conditions determined that refluxing the mixture of the 3-formylchromones,HKAs,and various R_(2)P(O)H in propylene carbonate(PC)in the presence of triethylamine as a base facilitated the highest yields of the DAPDHP *** cascade reaction,which involved the cleavage of one C-O bond in the 3-formylchromone substrates and the formation of three new bonds(one C-C,one C-N,and one C-P bond),enabled the synthesis of a small library of DAPDHP *** dearomatized DAPDHP products were formed by the regioselective nucleophilic addition of the R_(2)P(O)H reagents to the intermediate pyridinium salts *** approach has several advantages such as the use of an environmentally-friendly solvent,simple and practical operation(with filtration and washing without column chromatography separation),good yields,and a product with potential biological activity.

关键词： 2-(Diarylphosphoryl)-1,2-dihydropyridine Cascade reaction selective synthesis Heterocyclic ketene aminals

Multicomponent cascade reaction of 3-formylchromones:Highly regioselective synthesis of functionalized pyridin-2(1H)-ones

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

绿色合成与催化(英文) 2023年第3期4卷 231-239页

作者： Xinghan Yun Li Chen Ying Lv Zihan Lu Kun Huang Shengjiao Yan Key Laboratory of Medicinal Chemistry for Natural Resource(Yunnan University) Ministry of EducationSchool of Chemical Science and TechnologyYunnan UniversityKunming650091China

A novel protocol was developed for the construction of highly functionalized pyridin-2(1H)-ones from 3-formylchromones,ethyl 2-(pyridin-2-yl)acetate derivatives and amines via a complex multicomponent cascade reaction involving targeted duplicated ring-opening and duplicated cyclization reactions which form skeleton-reorganized target compounds.A series of pyridin-2(1H)-ones were produced by this reaction accompanied by the formation of three bonds(one C–N and two C–C bonds)and the cleavage of one bond in one *** protocol can be used in combinatorial and parallel syntheses of various pyridin-2(1H)-ones with potent biological *** advantages of this approach include simple and practical operation(multicomponent one-pot),high yields(up to 91%),and products with potential biological activity.

关键词： Pyridin-2(1H)-ones Cascade reaction selective synthesis 3-Formylchromones

A Solvothermal Route to Cu_2O Nanocubes and Cu Nanoparticles

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2006年第5期22卷 547-551页

作者： TANG Xin-ling REN Ling SUN Ling-na TIAN Wei-guo CAO Min-hua HU Chang-wen The Institute for Chemical Physics and Department of Chemistry Beijing Institute of Technology Beijing 100081 P. R. China Faculty of Chemistry Northeast Normal University Changchun 130024 P. R. China

Cu2O nanocubes and Cu nanoparticles were prepared by reducing Cu（ Ⅱ ） salt with ethanol as the reducing agent and solvent in the presence of multidentate ligand poly（vinylpyrrolidone）（PVP） under different conditions. The morphologies and the crystalline structures of the products were characterized by using scanning electron microscopy （SEM）, transmission electron microscopy（TEM）, selected-area electron diffraction（ SAED）, and powder X-ray diffraction（XRD）. In particular, the influences of the solvothennal reaction temperature and alkalinity on the products were investigated. A lower temperature and a lower alkali concentration favor the formation of the Cu2O phase, whereas a higher temperature and a higher alkali concentration generally lead to the formation of the Cu phase.

关键词： Cu2O nanocube Cu nanoparticle Ethanol Poly(vinylpyrrolidone) selective synthesis

Cleaner and convenient preparation of 3-（4,6-dimethoxy-pyrimidin-2-yloxy）-2-methyl-phenol

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University Science 2004年第8期5卷 956-959页

作者：文岳中方兆华刘维屏 InstituteofEnvironmentalScience CollegeofEnvironmental＆ResourceSciencesZhejiangUniversityHangzhou310029China

Environmental concerns have highlighted the need of cleaner technologies. A cleaner, convenient and selective technology has been developed for the preparation of 3-(4,6-dimethoxy-pyrimidin-2-yloxy)-2-methyl-phenol (DPMP) from 2-methyl-benzene-1,3-diol in water as solvent. The isolated yield of DPMP is up to 86% in good selectivity. The product structure was characterized by conventional methods, H-NMR and MS. This technology belongs to the modern concept of 1 environmentally friendly low wastes or non-wastes technology (LWNWT).

关键词： Cleaner preparation Greener technology selective synthesis 2-methyl-benzene-1 3-diol 3-(4 6-dimeth- oxy-pyrimidin-2-yloxy)-2-methyl-phenol

synthesis of Novel Cyclodextrin Dimers Linked by Multidentate Coordination Units

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第2期9卷 135-138页

作者： Mei Ming LUO Ru Gang XIE Wei LU ping Fang XLA Hua Ming ZHAO (Department of Chemistry, Sichuan University, Chengdu 610064Department of Chemistry, Sichuan Educational College, Chengdu 610041) Department of Chemistry Sichuan University Chengdu 610064 China Department of Chemistry Sichuan Educational College Chengdu 610041 China

A new type of cyclodextrin dimers (2a-c) bridged with multidentate coordination units has been synthesized by treatment of 6-deoxy-6-hydroxyethylamino-beta-cyclodextrin 1 with corresponding dibromides in the presence ... 详细信息

关键词： cyclodextrin dimers selective synthesis

Bi(OTf)3-catalyzed tandem reaction of naphthols with β,γ-unsaturated *** synthesis of functionalized 4H-chromenes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2014年第9期25卷 1235-1239页

作者： Hui-Jing Li Dong-Hui Luo Qin-Xi Wu Chun-Yang Dai Zhi-Lun Shen Yan-Chao Wu School of Marine Science and Technology Harbin Institute of Technology at Weihai Beijing National Laboratory for Molecular Sciences (BNLMS) and Key Laboratory of Molecular Recognition and FunctionInstitute of Chemistry Chinese Academy of Sciences

An efficient synthesis of functionalized 4H-chromenes by the tandem reaction of β,γ-unsaturated α- ketoesters with 2-naphthols, 1 -naphthols, and 1,3-dihydroxynaphthalenes has been accomplished with high selectivity and excellent yields in the presence of a catalytic amount of bismuth triflate [Bi（OTf）3, 5 mol%] under mild conditions. The functionalized 4H-chromene synthesis and our previous 2H- chromene hemiacetal synthesis could complement each other to enrich reaction diversity.

关键词： Bismuth triflate 4H-Chromenes Tandem reaction selective synthesis

Microwave-assisted controllable synthesis of 2-acylbenzothiazoles and bibenzo[b][1,4]thiazines from aryl methyl ketones and disulfanediyldianilines

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第11期32卷 3544-3547页

作者： Yuquan Qi Xiaoyu Gu Xianqiang Huang Guodong Shen Bingchuan Yang Qjngpeng He Zechun Xue Mengcheng Du Lilong Shi Bing Yu Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology School of Chemistry&Chemical EngineeringLiaocheng UniversityLiaocheng 252059China Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450001 China National Rubber Additive Engineering Technology Center Liaocheng 252059China

A condition-controlled strategy for selectively synthesis of 2-acylbenzothiazoles and bibenzo[b][1,4]thiazines from aryl methyl ketones and disulfanediyldianilines was realized using I_(2)/DMSO or I_(2)/MeCN systems,*** desired products were synthesized in only 15 min with moderate to excellent yields(50%-90%)under microwave-assisted,metal-free *** strategy provides a great advantage for selective synthetic applications in the efficient synthesis of benzothiazoles and bibenzothiazines heterocycle compounds.

关键词： selective synthesis Metal-free Microwave-assisted Condition-controlled Heterocycle compounds