Hypervalent iodine(iii)-induced oxidative [4+2] annulation of o-phenylenediamines and electron-deficient alkynes: direct synthesis of quinoxalines from alkyne substrates under metal-free conditions
Hypervalent iodine(iii)-induced oxidative [4+2] annulation of o-phenylenediamines and electron-deficient alkynes: direct synthesis of quinoxalines from alkyne substrates under metal-free conditions
Sulphonomercuriation route to vinyl and ethynyl sulphones
作者:Perumal Rajakumar、Arunachalam Kannan
DOI:10.1039/c39890000154
日期:——
Ethynylsulphones were obtained from the reaction of substituted acetylenes with mercury(II) chloride and sodium benzenesulphinate followed by oxidative demercuriation.
乙炔砜是由取代的乙炔与氯化汞(II)和苯磺酸钠反应,然后进行氧化脱汞反应制得的。
An Expedient Route for the Stereoselective Construction of Bridged Polyheterocyclic Ring Systems Using the Tandem “Pincer” Diels−Alder Reaction
作者:Mark Lautens、Eric Fillion
DOI:10.1021/jo9701593
日期:1997.6.1
The tandem "pincer" Diels-Alder reaction, consisting of two consecutive [4 + 2] cycloadditions between two dienes and an acetylenic bis-dienophile, has been applied toward the rapid construction of bridged polyoxacyclic ring systems when furan derivatives are used as the diene components. The study has demonstrated the stereoselectivity (exo-exo adduct), the chemoselectivity ("pincer" vs "domino")
Ready syntheses of benzoporphyrins via Diels–Alder reactions with protoporphyrin IX
作者:Alan R. Morgan、Veronica Scherrer Pangka、David Dolphin
DOI:10.1039/c39840001047
日期:——
Reaction of protoporphyrinIX dimethyl ester with strongly activated dienophiles causes a Diels–Alderreaction to occur with the porphyrin periphery; elimination of the angular methyl group from these adducts gives monobenzoporphyrins.
Non-Friedländer Route to Diversely 3-Substituted Quinolines through Au(III)-Catalyzed Annulation Involving Electron-Deficient Alkynes
作者:Elena I. Chikunova、Vadim Yu. Kukushkin、Alexey Yu. Dubovtsev
DOI:10.1021/acs.orglett.3c03775
日期:2023.12.8
alkynylphosphonates, propiolonitriles, and trifluoromethylated alkynes can be used as the starting materials for the preparation of quinolines diversely substituted at position 3. On the basis of experimental data, we proposed a reaction mechanism in which gold(III) functions as a strong electrophilic activator of the C≡C bond and the carbonyl group. The synthetic potential of the presented method is additionally