Ruthenium-Catalyzed Cyclization of Alkyne−Epoxide Functionalities through Alternation of the Substituent and Structural Skeleton of Epoxides
摘要:
Treatment of 1-(o-ethynylphenyl)-2-alkyl-2-aryl epoxides with TpRuPPh(3)(CH3CN)(2)PF6 catalyst (10 mol %) in hot toluene (100 degreesC, 12 h) led to an atypical cyclization and gave 1-aryl-2-alkyl-1H-indene derivatives and carbon monoxide efficiently. The cyclization of 1-cis-enynyl-2-alkyl epoxides with this catalyst in hot toluene (10 mol %, 100 degreesC, 12 h) gave 2,5-disubstituted phenols in 45-72% yields. Under the same conditions, 1-cis-enynyl-2,2-dialkyl epoxides and 1-cis-enynyl-2-alkyl-2-aryl epoxides gave the corresponding 6,6-disubstituted cyclohexa-2,4-dien-1-ones in good yields (85-91%). Mechanisms for these new cyclization reactions are proposed on the basis of trapping experiments and isotope labeling experiments. The formation of 1H-indene products likely involves ruthenium-acyl intermediates whereas cyclohexa-2,4-dien-1-ones are thought to derive from ruthenium-ketene intermediates.
Ruthenium-Catalyzed Cyclization of Alkyne−Epoxide Functionalities through Alternation of the Substituent and Structural Skeleton of Epoxides
摘要:
Treatment of 1-(o-ethynylphenyl)-2-alkyl-2-aryl epoxides with TpRuPPh(3)(CH3CN)(2)PF6 catalyst (10 mol %) in hot toluene (100 degreesC, 12 h) led to an atypical cyclization and gave 1-aryl-2-alkyl-1H-indene derivatives and carbon monoxide efficiently. The cyclization of 1-cis-enynyl-2-alkyl epoxides with this catalyst in hot toluene (10 mol %, 100 degreesC, 12 h) gave 2,5-disubstituted phenols in 45-72% yields. Under the same conditions, 1-cis-enynyl-2,2-dialkyl epoxides and 1-cis-enynyl-2-alkyl-2-aryl epoxides gave the corresponding 6,6-disubstituted cyclohexa-2,4-dien-1-ones in good yields (85-91%). Mechanisms for these new cyclization reactions are proposed on the basis of trapping experiments and isotope labeling experiments. The formation of 1H-indene products likely involves ruthenium-acyl intermediates whereas cyclohexa-2,4-dien-1-ones are thought to derive from ruthenium-ketene intermediates.
Gold(I) Catalysis Applied to the Stereoselective Synthesis of Indeno[2,1-<i>b</i>]thiochromene Derivatives and Seleno Analogues
作者:Cintia Virumbrales、Mahmoud A. E. A. A. A. El-Remaily、Samuel Suárez-Pantiga、Manuel A. Fernández-Rodríguez、Félix Rodríguez、Roberto Sanz
DOI:10.1021/acs.orglett.2c03411
日期:2022.11.4
synthesis of sulfur- or selenium-containing indeno[1,2-b]chromene derivatives from o-(alkynyl)styrenes substituted at the triple bond with a thio- or seleno-aryl group is described. The reaction involves a double cyclization process through a proposed key gold–cyclopropyl carbene intermediate that evolves by the intramolecularaddition of an aromatic to the cyclopropane ring, affording polycyclic structures
金 (I) 催化的级联反应,用于立体选择性合成含硫或含硒的茚并 [1,2- b ] 色烯衍生物,从邻(炔基)苯乙烯在三键处被硫代或硒代芳基取代组进行了说明。该反应涉及通过提出的关键金-环丙基卡宾中间体的双环化过程,该中间体通过将芳族化合物分子内加成到环丙烷环上而形成,提供多环结构。使用带有手性配体的金 (I) 配合物研究了对映选择性版本。
Ruthenium-Catalyzed Cyclization of Alkyne−Epoxide Functionalities through Alternation of the Substituent and Structural Skeleton of Epoxides
作者:Lin Ming-Yuan、Reniguntala J. Madhushaw、Rai-Shung Liu
DOI:10.1021/jo048983w
日期:2004.10.1
Treatment of 1-(o-ethynylphenyl)-2-alkyl-2-aryl epoxides with TpRuPPh(3)(CH3CN)(2)PF6 catalyst (10 mol %) in hot toluene (100 degreesC, 12 h) led to an atypical cyclization and gave 1-aryl-2-alkyl-1H-indene derivatives and carbon monoxide efficiently. The cyclization of 1-cis-enynyl-2-alkyl epoxides with this catalyst in hot toluene (10 mol %, 100 degreesC, 12 h) gave 2,5-disubstituted phenols in 45-72% yields. Under the same conditions, 1-cis-enynyl-2,2-dialkyl epoxides and 1-cis-enynyl-2-alkyl-2-aryl epoxides gave the corresponding 6,6-disubstituted cyclohexa-2,4-dien-1-ones in good yields (85-91%). Mechanisms for these new cyclization reactions are proposed on the basis of trapping experiments and isotope labeling experiments. The formation of 1H-indene products likely involves ruthenium-acyl intermediates whereas cyclohexa-2,4-dien-1-ones are thought to derive from ruthenium-ketene intermediates.