将金( I )配合物固定在有序介孔聚合物FDU-15上,合成了一系列新型非均相金( I )催化剂,并通过XRD、N 2吸附-脱附、FT-IR、TEM、EDS等对其进行了表征。这些催化剂中的一部分通过烯丙醇的胺化反应进行了评估。在所研究的催化剂中,FDU-( p -CF 3 Ph) 2 PAuCl ( 3d ) 被确定为最有效的催化剂。与均相催化剂相比,非均相金的催化活性增强(I)催化剂与FDU-15的介孔结构密切相关。该催化体系适用于广泛的底物,并且可以很容易地回收和再循环至少十二次而不会显着损失催化活性。此外,进一步检查了3d的催化性能,用于分子内环化合成杂环化合物。
Aqueous Ammonia as a New Activator for Sonogashira Coupling
作者:Mohamed S. Mohamed Ahmed、Akitoshi Sekiguchi、Kentaro Masui、Atsunori Mori
DOI:10.1246/bcsj.78.160
日期:2005.1
Sonogashira coupling, which is a coupling reaction of terminal alkynes with organic halides, takes place with dilute aqueous ammonia as an activator. The reaction of several terminal alkynes and aryl iodides in the presence of small excess of aqueous ammonia at room temperature furnishes the cross-coupling product in good-to-excellent yields. A water-soluble amine with a high boiling point is alternatively employed for reactions at higher temperatures. A related coupling reaction in the presence of carbon monoxide also proceeded at room temperature and under ambient pressure to afford α,β-alkynyl ketones efficiently.
gold(I) catalysts were synthesized by immobilizing gold(I) complexes on ordered mesoporous polymer FDU-15 and characterized by XRD, N2 adsorption–desorption, FT-IR, TEM, EDS, etc. The catalytic activities of these catalysts were evaluated by the amination reactions of allylic alcohols. Among the catalysts investigated, FDU-(p-CF3Ph)2PAuCl (3d) was identified as the most efficient catalyst. Compared
将金( I )配合物固定在有序介孔聚合物FDU-15上,合成了一系列新型非均相金( I )催化剂,并通过XRD、N 2吸附-脱附、FT-IR、TEM、EDS等对其进行了表征。这些催化剂中的一部分通过烯丙醇的胺化反应进行了评估。在所研究的催化剂中,FDU-( p -CF 3 Ph) 2 PAuCl ( 3d ) 被确定为最有效的催化剂。与均相催化剂相比,非均相金的催化活性增强(I)催化剂与FDU-15的介孔结构密切相关。该催化体系适用于广泛的底物,并且可以很容易地回收和再循环至少十二次而不会显着损失催化活性。此外,进一步检查了3d的催化性能,用于分子内环化合成杂环化合物。
Carbonylative Sonogashira Coupling of Terminal Alkynes with Aqueous Ammonia
作者:Mohamed S. Mohamed Ahmed、Atsunori Mori
DOI:10.1021/ol035007a
日期:2003.8.1
graphicCarbonylative coupling of phenylethyne with 4-methoxy-1-iodobenzene in the presence of 1 mol % PdCl2(PPh3)2, 2 equiv of 0.5 M aqueous ammonia, and CO (1 atm) gives the corresponding alpha,beta-alkynyl ketone in 72% isolated yield after stirring at room temperature for 41 h, while noncarbonylative coupling product is not obtained.
Metal-Free Brønsted Acid-Catalyzed Rearrangement of δ-Hydroxyalkynones to 2,3-Dihydro-4<i>H</i>-pyran-4-ones: Total Synthesis of Obolactone and a Catechol Pyran Isolated from <i>Plectranthus sylvestris</i>
作者:Sachin P. Gholap、Dashrath Jangid、Rodney A. Fernandes
DOI:10.1021/acs.joc.8b03141
日期:2019.3.15
A metal-free, Brønsted acid, pTsOH-catalyzed intramolecular rearrangement of δ-hydroxyalkynones to substituted 2,3-dihydro-4H-pyran-4-ones was developed. The rearrangement occurs with high regioselectivity under mild and open-air conditions. The scope of work was illustrated by synthesizing an array of aliphatic and aromatic substituted 2,3-dihydro-4H-pyran-4-ones in up to 96% yield, 100% atom economy