Chemo-, regio-, and stereoselective hydroboration of conjugated enyne alcohol/amine: facile synthesis of Z , Z -/ Z , E -1,3-dien-1/2-ylboronic ester bearing hydroxyl/amino group
Hydroboration of conjugated enyne alcohol/amine is studied by using copper salts and bis(pinacolato)diboron as pre-catalysts and boron source respectively. It is suggested that the chemo-selectivity is derived from a combined electronic influence of the heteroatoms on the substrate and the ligand on the transition metal. The regioselectivity is probably dominated mainly by electronic effect of the
Base-promoted cycloaddition reactions of 1-aryl- or 1-aryl-7-substituted-4-oxahepta-1,6-diyne systems in DMSO have proven to involve an anionic intramolecularDiels-Alder process taking place even at room temperature in spite of the reaction suffering from temporary disruption of aromaticity. Although initially formed alpha-arylallenide anion can be protonated by DMSO, it can be back to the allenide
New acetylenic furan derivatives: synthesis and anti-inflammatory activity
作者:Gilson Zeni、Diogo S Lüdtke、Cristina W Nogueira、Rodrigo B Panatieri、Antonio L Braga、Claudio C Silveira、Hélio A Stefani、Joao B.T Rocha
DOI:10.1016/s0040-4039(01)01984-0
日期:2001.12
A series of acetylenic furan derivatives have been synthesized via Pd-catalyzed coupling reactions of 2-(alkyltelluro)furan with several terminal alkynes. These compounds showed good anti-inflammatory activity in the carrageenin-induced rat paw edema assay. This represents a new and efficient method for the synthesis of pharmacologically active compounds.
A gold(<scp>i</scp>)-catalyzed substituent-controlled cycloisomerization of propargyl vinyl ethers to multi-substituted furofuran and furopyran derivatives
A gold(I)-catalyzed substituent-controlled strategy for the stereoselective synthesis of bicyclic furan and pyran derivatives has been developed. The mechanisms of the reactions have been studied thoroughly by deuterium labelling experiments....
Quantum Mechanical Prediction and Experimental Verification of Au(I)-Catalyzed Substitution-Controlled Syntheses of 1<i>H</i>-Pyrido[4,3-<i>b</i>]indole and Spiro[indoline-3,3′-pyridine] Derivatives
functional theory calculations were applied to predict the pathways of gold(I)-catalyzed cycloisomerization of the indole substrates with 1,6-enynes, which were consistent with the ensuing experimental results. The substitution-controlled synthesis led to the formation of 1H-pyrido[4,3-b]indole and spiro[indoline-3,3′-pyridine] derivatives in a tunable way. The reactions had good functional group tolerances
应用密度泛函理论计算预测了金(I)催化的吲哚底物与 1,6-烯炔的环化异构化途径,这与随后的实验结果一致。取代控制合成导致以可调方式形成 1 H-吡啶并[4,3- b ]吲哚和螺[吲哚啉-3,3'-吡啶]衍生物。该反应具有良好的官能团耐受性,并根据计算和实验结果提出了可能的机理。