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Acetylenic Esters (acetylenic + ester)
Selected AbstractsChemInform Abstract: Four-Component Reaction of Isocyanides, Acetylenic Esters, and Carboxylic Acids for the Synthesis of Functionalized 2,5-Diaminofurans.CHEMINFORM, Issue 44 2009Mohammad Anary-Abbasinejad Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Synthesis of Fully Substituted Iminolactones (IV) via a Three-Component Condensation of Isocyanides and Acetylenic Esters with 2-Bromo-1-(4-bromophenyl)ethanone.CHEMINFORM, Issue 37 2008Ahmad Shaabani Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: A Novel Approach to the Synthesis of Highly Functionalized Thiophenes Using Isocyanides Catalyzed Reaction of Acetylenic Esters with 3-Mercapto-2-butanone.CHEMINFORM, Issue 28 2008Robabeh Baharfar Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Reaction Between Imides and Electron-Poor Acetylenic Esters in the Presence of Dipotassium Hydrogen Phosphate Powder in Solvent-Free Conditions: An Efficient Method for the Synthesis of Electron-Poor N-Vinyl Imides.CHEMINFORM, Issue 27 2008Ali Ramazani Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Copper-Catalyzed Addition of Diboron Reagents to ,,,-Acetylenic Esters: Efficient Synthesis of ,-Boryl-,,,-ethylenic Esters.CHEMINFORM, Issue 25 2008Ji-Eon Lee Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Reactions of Aroylthioureas with Acetylenic Esters and Dibenzoyl Ethylene.CHEMINFORM, Issue 12 20083-Thiazines., Selectivity Towards the Formation of New Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: One-Pot Synthesis of Stable Phosphite Ylides by Three-Component Reaction Between Acetylenic Esters, Aldehyde Semicarbazones and Tributyl or Triethyl Phosphite.CHEMINFORM, Issue 6 2008Mohammad Anary-Abbasinejad Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Synthesis of Functionalized 1-Azadienes by Reaction of 2,6-Dimethylphenyl Isocyanide and Acetylenic Esters in the Presence of CH Acids.CHEMINFORM, Issue 40 2007Issa Yavari Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Synthesis of Furan-Bridged 10-Membered Rings Through [8 + 2]-Cycloaddition of Dienylfurans and Acetylenic Esters.CHEMINFORM, Issue 37 2005Lei Zhang No abstract is available for this article. [source] Synthesis of New Stable Crystalline Zwitterionic Products from the Reactions of 1-Methylimidazole, Acetylenic Esters and Strong Cyclic CH-Acids.CHEMINFORM, Issue 34 2005Mohammad Bagher Teimouri Abstract For Abstract see ChemInform Abstract in Full Text. [source] Cycloaddition Reactions of Neutral 2-Azadienes with Acetylenic Esters.CHEMINFORM, Issue 24 2005Francisco Palacios No abstract is available for this article. [source] Reactions of 5-Mercaptoazoles and Pyridine-2-thiones with Acetylenic Esters.CHEMINFORM, Issue 20 2003Selectivity of the Formation of Novel Fused Thiazin-4-ones, Thiazolidin-4-ones. Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: Cyclic Acetal Formation Between 2-Pyridinecarboxyaldehyde and ,-Hydroxy-,,,-acetylenic Esters.CHEMINFORM, Issue 8 2009Sami Osman Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Highly Enantioselective Synthesis of ,-Hydroxy-,,,-acetylenic Esters by Asymmetric Alkyne Addition to Aldehydes.CHEMINFORM, Issue 19 2006Ge Gao Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Reaction of benzohydroximinoyl chlorides and ,-(trifluoromethyl)-acetylenic esters: Synthesis of regioisomeric (trifluoromethyl)-isoxazolecarboxylate esters and oxime addition productsJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 4 2003Bruce C. Hamper The triethylamine induced reaction of benzohydroximinoyl chlorides, precursors of nitrile oxides, with ,-trifluoromethylacetylenic esters gives rise to three products: 5-trifluoromethyl-4-isoxozolecarboxylate esters, regioisomeric 4-trifluoromethyl-5-isoxazolecarboxylate esters and an unexpected oxime 1,4-addition adduct. Product distribution is rationalized in terms of two competing reaction modes, either 1,4 addition of the oxime anion to the acetylenic ester or formation of the nitrile oxide followed by 1,3-dipolar cycloaddi-tion. Anionic 1,4-addition of the oximinoyl chloride to the acetylenic ester is preferred at low temperatures, while nitrile oxide formation followed by cycloaddition is preferred at temperatures above 0 °C. Regioisomeric products from addition of nitrile oxides to various perfluoroalkylacetylenes are compared and assigned by 13C NMR. [source] Propyne Iminium Salts and Phosphorus(III) Nucleophiles: Synthesis of (3-Morpholinoallenyl)phosphanes and -phosphane Oxides or 1-(Morpholinopropargyl)phosphanes and -phosphonatesEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 11 2003Martin Reisser Abstract Treatment of 4-(1,3-diphenyl-l-propynylidene)morpholinium triflate (1a) with the neutral phosphorus nucleophiles Me3Si,PPh2, Me3Si,P(Ph)C5H11, and Me3SiO,PPh2 affords (3-morpholinoallenyl)phosphanes 4 and 5 and (3-morpholinoallenyl)phosphane oxide 11, respectively. In contrast to these conjugate addition reactions at the ambident propyne iminium moiety of 1a, nucleophilic attack by Me3Si,PEt2 and Me3SiO,P(OEt)2 takes place at the iminium function and gives (1-morpholinopropargyl)phosphane 6 and (1-morpholinopropargyl)phosphonate 12, respectively. Propyne iminium salt 1b reacts with Me3Si,PPh2 to form (3-morpholino-1,3-butadienyl)phosphane oxide 8. The bis(donor)-substituted allene 4 is transformed by oxidation of the phosphorus substituent into the push-pull substituted allenylphosphane oxide 11. Treatment of allene 4 with elemental sulfur results in the formation of betaine 16, which undergoes [3+2] cycloaddition reactions with acetylenic esters to afford 5-benzylidene-4,5-dihydrothiophenes 17 and 18. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003) [source] 1,8-Diazafloren-9-one with alkyl and aryl isocyanides in the presence of acetylenic esters: A facile synthesis of ,-spiroiminolactonesJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 2 2006Malek Taher Maghsoodlou The 1:1 intermediate generated by the addition of alkyl and aryl isocyanides to dialkyl acetylenedicarboxylate is trapped by 1,8-diazafloren-9-one to yield iminolactones in good yields. [source] Reaction of benzohydroximinoyl chlorides and ,-(trifluoromethyl)-acetylenic esters: Synthesis of regioisomeric (trifluoromethyl)-isoxazolecarboxylate esters and oxime addition productsJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 4 2003Bruce C. Hamper The triethylamine induced reaction of benzohydroximinoyl chlorides, precursors of nitrile oxides, with ,-trifluoromethylacetylenic esters gives rise to three products: 5-trifluoromethyl-4-isoxozolecarboxylate esters, regioisomeric 4-trifluoromethyl-5-isoxazolecarboxylate esters and an unexpected oxime 1,4-addition adduct. Product distribution is rationalized in terms of two competing reaction modes, either 1,4 addition of the oxime anion to the acetylenic ester or formation of the nitrile oxide followed by 1,3-dipolar cycloaddi-tion. Anionic 1,4-addition of the oximinoyl chloride to the acetylenic ester is preferred at low temperatures, while nitrile oxide formation followed by cycloaddition is preferred at temperatures above 0 °C. Regioisomeric products from addition of nitrile oxides to various perfluoroalkylacetylenes are compared and assigned by 13C NMR. [source] An easy route to 2-substituted-2,3-dihydro-5(7)H -oxazolo[3,2- a]pyrimidin-5-ones and 7-ones starting from the corresponding 2-amino-2-oxazolinesJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 4 2001I. Forfar The isomeric 2-substituted-7(5)-methyl-2,3-dihydro-5(7)H -oxazolo[3,2- a]pyrimidin-5-ones 3a-b and 7-ones 2a-b,7a were synthesized by cyclocondensation from the 5-substituted-2-amino-2-oxazolines 1a-b with biselectrophiles. In boiling ethanol, the reaction of 1a-b with acetylenic esters led to a mixture of 2a-b,7a with a small amount of (E)-2- N -(2-ethoxycarbonylethylene)-5-substituted-2-iminooxazolines 5a-b. The ring annulation between 1a-b and diketene gave the 2-substituted-7-hydroxy-7-methyl-2,3,6,7-tetrahydro-5H -oxazolo[3,2- a]pyrimidin-5-ones 4a-b which can be easily dehydrated to provide the 2-substituted-7-methyl-2,3-dihydro-5H -oxazolo[3,2- a]pyrimidin-5-ones 3a-b. [source] |